How to validate an email address in JavaScript

Question

Is there a regular expression to validate an email address in JavaScript

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Simply check out if the entered email address is valid or not using HTML    lt input type  email   gt    There isn t any need to write a function for validation

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If you define your regular expression as a string then all backslashes need to be escaped  so instead of   w  you should have   w    Alternatively  define it as a regular expression   var pattern      w   a-zA-Z       a-zA-Z  2 3

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This was stolen from http   codesnippets joyent com posts show 1917  email      email    filter       a-zA-Z0-9    -        a-zA-Z0-9 -         a-zA-Z0-9  2 4       if  filter test email value          Yay  valid   return true    else    return false

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General email regex  RFC 5322 Official Standard   https   emailregex com   JavaScript          lt  gt              s          lt  gt              s                     0-9  1 3    0-9  1 3    0-9  1 3    0-9  1 3       a-zA-Z -0-9       a-zA-Z  2

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Whoever is using  pvl solution and wants it to pass ESLint Prefer-template then here s a version where I used template literals instead of string concatenation   validateEmail email        let sQtext        x0d  x22  x5c  x80-  xff        let sDtext        x0d  x5b-  x5d  x80-  xff        let sAtom        x00-  x20  x22  x28  x29  x2c  x2e  x3a-  x3c  x3e  x40  x5b-  x5d  x7f-  xff         let sQuotedPair      x5c   x00-  x7f        let sDomainLiteral      x5b   sDtext    sQuotedPair     x5d       let sQuotedString      x22   sQtext    sQuotedPair     x22       let sDomainRef   sAtom      let sSubDomain       sDomainRef    sDomainLiteral         let sWord       sAtom    sQuotedString         let sDomain      sSubDomain    x2e  sSubDomain          let sLocalPart      sWord    x2e  sWord          let sAddrSpec      sLocalPart   x40  sDomain       complete RFC822 email address spec     let sValidEmail       sAddrSpec        as whole string      let reValidEmail   new RegExp sValidEmail        return reValidEmail test email

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lt input type  email  class  form-control  required  required  placeholder  Email Address  name  Email  id  Email  autocomplete  Email  gt    lt button class  btn-1 shadow-0 full-width  type  button  id  register  gt Register account lt  button gt              register   click function               var rea      a-zA-Z0-9      amp              -    a-zA-Z0-9     a-zA-Z0-9-  0 61  a-zA-Z0-9         a-zA-Z0-9     a-zA-Z0-9-  0 61  a-zA-Z0-9             var Email       Email   val        var x   rea test Email       if   x            alert  Type Your valid Email            return false                     lt  script gt

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JavaScript can match a regular expression   emailAddress match    some regex       Here s an RFC22 regular expression for emails        gt  a-zA-Z d     amp     -             x20         x01- x7f             x01- x7f      x20      lt angle gt  lt              gt     a-zA-Z d     amp     -                      x01- x 7f             x01- x7f           -  a-zA-Z d -     lt  -      a-zA-Z  2            lt          25 0-5  2 0-4  d  01   d  d   4   a-zA-Z d -   a-zA-Z d        x01- x7f                 x01- x7f          angle  gt

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Simple regex for email-Id   String EMAIL PATTERN         lt  gt             s           lt  gt             s                        lt  gt            s            lt  gt            s     2

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This is a JavaScript translation of the validation suggested by the official Rails guide used by thousands of websites          s         -a-z0-9       a-z  2     i   Relatively simple but tests against most common errors   Tested on a dataset of thousands of emails and it had zero false negatives positives   Example usage   const emailRegex          s         -a-z0-9       a-z  2     i   emailRegex test  email example com          true     Multi-word domains emailRegex test  email example co uk        true emailRegex test  email mail gmail com       true     Valid special characters emailRegex test  unusual but valid email1900       amp     -            example com      true     Trailing dots emailRegex test  email example co uk        false     No domain emailRegex test  email example              false     Leading space emailRegex test   email example com         false     Trailing space emailRegex test  email example com          false     Incorrect domains emailRegex test  email example com          false     Other invalid emails emailRegex test  invalid email com             false emailRegex test  invalid email domain com      false emailRegex test  email example  com            false

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If you are using AngularJS  just add type  email  to the input element       https   docs angularjs org api ng input input 5Bemail 5D   In case there is no input element  it can be created dynamically   var isEmail    compile   lt input ng-model  m  type  email  gt     rootScope  new         controller  ngModel    validators  email     if  isEmail  email gmail com        console log  valid

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In nodeJS you can also use validator node module and simply use like that   Install the library with npm install validator  var validator   require  validator     validator isEmail  foo bar com        gt  true

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How to write Particular Regular Expression in android or java   1  USER NAME      A-Za-z0-9 -  min number of character max number of character      2  TELEPHONE            0-9  -      3  TELEPHONE OPTIONAL                0-9  -        4  EMAIL     a-zA-Z0-9       -    a-zA-Z0-9-      a-zA-Z0-9-         5  EMAIL OPTIONAL         a-zA-Z0-9       -    a-zA-Z0-9-      a-zA-Z0-9-           6  WEB URL         http        https          www     a-zA-Z0-9     a-zA-Z0-9    a-z  3     a-z          7  WEB URL YOUTUBE BE    https           www     youtu      be    com           v     v      a-zA-Z0-9   -      8  POSTAL ADDRESS     a-zA-Z  d  s  -                  9  FIELD NOT EMPTY        s      10  PINCODE       0-9  6        11  IFSC CODE         s  4   d 7      12  SWIFT CODE       0-9  10        13  PINCODE       0-9  6

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The personal info part contains the following ASCII characters     Uppercase  A-Z  and lowercase  a-z  English letters  Digits  0-9   Characters           amp        -                       Character     period  dot or fullstop  provided that it is not the first or last character and it will not come one after the other    The domain name  for example com  org  net  in  us  info  part contains letters  digits  hyphens  and dots     function ValidateEmail mail      if     w     -   w     w     -   w       w 2 3      test myForm emailAddr value           return  true          alert  You have entered an invalid email address        return  false

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Following regular expression        w       w        w       w  2 3   1 2

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This is the correct RFC822 version   function checkEmail emailAddress      var sQtext        x0d  x22  x5c  x80-  xff      var sDtext        x0d  x5b-  x5d  x80-  xff      var sAtom        x00-  x20  x22  x28  x29  x2c  x2e  x3a-  x3c  x3e  x40  x5b-  x5d  x7f-  xff       var sQuotedPair      x5c   x00-  x7f      var sDomainLiteral      x5b     sDtext         sQuotedPair        x5d     var sQuotedString      x22     sQtext         sQuotedPair        x22     var sDomain ref   sAtom    var sSubDomain         sDomain ref         sDomainLiteral          var sWord         sAtom         sQuotedString          var sDomain   sSubDomain       x2e    sSubDomain           var sLocalPart   sWord       x2e    sWord           var sAddrSpec   sLocalPart      x40    sDomain     complete RFC822 email address spec   var sValidEmail         sAddrSpec           as whole string    var reValidEmail   new RegExp sValidEmail      return reValidEmail test emailAddress

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Regex for validating email address   a-z0-9     amp              -        a-z0-9     amp              -         a-z0-9     a-z0-9-   a-z0-9        a-z0-9     a-z0-9-   a-z0-9

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I prefer to keep it simple and keep my users happy   I also prefer code which is easy to understand  RegEx is not   function isValidEmail value        const atLocation   value lastIndexOf           const dotLocation   value lastIndexOf            return           atLocation  gt  0  amp  amp          dotLocation  gt  atLocation   1  amp  amp          dotLocation  lt  value length - 1              Get the location of the last     and the last     Make sure the     is not the first char  there is something before it   Make sure the     is after the     and that there is at least one char between them Make sure there is at least a single char after the       Will this allow invalid email addresses to pass   Sure  but I don t think you need much more for a good user experience that allows you to enable disable a button  display an error message  etc   You only know for sure that an email address is valid when you attempt to send an email to that address

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Sectrean s solution works great  but it was failing my linter  So I added some escapes   function validateEmail email         var re          lt  gt            s           lt  gt            s                       0-9  1 3      0-9  1 3    0-9  1 3    0-9  1 3       a-zA-Z -0-9       a-zA-Z  2              return re test email

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I wrote a JavaScript email validator which is fully compatile with PHP s filter var  value  FILTER VALIDATE EMAIL  implementation   https   github com mpyw FILTER VALIDATE EMAIL js  import validateEmail from  filter-validate-email   const value         const result   validateEmail value    is equivalent to    lt  php   value           result    bool filter var  value  FILTER VALIDATE EMAIL  FILTER FLAG EMAIL UNICODE

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ES6 sample  const validateEmail  email   gt         lt  gt              s          lt  gt              s                     0-9  1 3    0-9  1 3    0-9  1 3    0-9  1 3       a-zA-Z -0-9       a-zA-Z  2       test email

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I ve slightly modified Jaymon s answer for people who want really simple validation in the form of  anystring anystring anystring  The regular expression    S   S    S    To prevent matching multiple   signs       s       s       Example JavaScript function   x000D   x000D  function validateEmail email                 var re     S   S    S            return re test email              console log validateEmail  anystring anystring anystring     x000D   x000D   x000D

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I know its not regex but any way     This is example with node and npm package email-existence this is ultimate checking if email exist and if its in the right form     This will ping the email if its responding if it got no response it will return false or else true   function doesEmailExist email        var emailExistence   require  email-existence        return emailExistence check email function  err status                if  status                    return status                            else                   throw new Error  Email does not exist

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In modern browsers you can build on top of  Sushil s answer with pure JavaScript and the DOM   function validateEmail value      var input   document createElement  input       input type    email     input required   true    input value   value     return typeof input checkValidity      function    input checkValidity       S   S    S   test value       I ve put together an example in the fiddle http   jsfiddle net boldewyn 2b6d5   Combined with feature detection and the bare-bones validation from Squirtle s Answer  it frees you from the regular expression massacre and does not bork on old browsers

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Very simple in JavaScript  follow this code   function validate        var email   document getElementById  Email        var filter       a-zA-Z0-9    -        a-zA-Z0-9 -         a-zA-Z0-9  2 4            if   filter test email value                 alert  Please Enter the valid email address            email focus          return false            else           return true          HTML code for this   form name  form       enctype  multipart form-data       name  form       action  register php       method  POST  onsubmit  return validate      gt       lt input type  text  placeholder  Enter ur Email Id  id  Email  name  Email    gt       lt input type  submit  id  submit  value  save  name  Like  class  button    gt   lt  form gt

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How about creating a function which will test any string against emails  pattern using regular expression in JavaScript  as we know email addresses can be quite different in different regions  like in UK and Australia it usually ends up with  co uk or  com au  so I tried to cover those as well  also check if the string passed to the function  something like this   var isEmail   function str      return typeof str    string   amp  amp      w  d         w  d         w  d     2 8    test str       and check if it s email like below   isEmail  alex example com      true isEmail  alireza test co uk      true isEmail  peter example yahoo com au      true isEmail  alex example com      true isEmail  peter 123 news com      true isEmail  hello7    ca com pt      true isEmail  example example co      true isEmail  hallo example coassjj sswzazaaaa      false isEmail  hallo2ww22 example    caaaao      false

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Now ReactNative Version 0 46 Use Below code for email Validation    validateEmail    email    gt         var re          lt  gt              s          lt  gt              s                     0-9  1 3    0-9  1 3    0-9  1 3    0-9  1 3       a-zA-Z -0-9       a-zA-Z  2             if  re test email            else          alert  email       Please enter valid emailID

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One of my coworker shared this regex with me  I like it a lot   function isValidEmailAddress  email        var validEmail   false      if  email            email   email trim   toLowerCase            var pattern       w-        w-        a-zA-Z0-9   a-zA-Z0-9-      a-zA-Z0-9-        a-zA-Z  2 6    d 1 3     3  d 1 3     d 4               validEmail   pattern exec email              return validEmail     if  typeof String prototype trim      function         String prototype trim   function             return this replace    s   s   g

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There is my version of an email validator  This code is done with object-oriented programming and realized as a class with static methods  You will find two versions of the validators  strict EmailValidator validate  and kind EmailValidator validateKind    The first throws an error if an email is invalid and returns email otherwise  The second returns Boolean value that says if an email is valid  I prefer the strict version in most of the cases   export class EmailValidator                   param  string  email         return  string          throws  Error              static validate email            email   this prepareEmail email            const isValid   this validateKind email            if  isValid              return email           throw new Error  Got invalid email    email                             param  string  email         return  boolean              static validateKind email            email   this prepareEmail email            const regex   this getRegex             return regex test email                          return  RegExp          private             static getRegex             return        lt  gt              s          lt  gt              s                     0-9  1 3    0-9  1 3    0-9  1 3    0-9  1 3        a-zA-Z -0-9       a-zA-Z  2                               param  string  email         return  string          private             static prepareEmail email            return String email  toLowerCase              To validate an email you can follow these ways      First way   try       EmailValidator validate  balovbohdan gmail com      catch  e        console error e message          Second way   const email    balovbohdan gmail com   const isValid   EmailValidator validateKind email    if  isValid      console log  Email is valid    email      else     console log  Email is invalid    email

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Regex update 2018  try this  let val    email domain com   if    a-z0-9  a-z0-9-        a-z   a-z0-9   a-z0-9-   a-z0-9     a-z0-9  2 10       a-z  2 10      test val        console log  passed        typscript version complete     export const emailValid    val string  boolean   gt     a-z0-9  a-z0-9-        a-z   a-z0-9   a-z0-9-   a-z0-9     a-z0-9  2 10       a-z  2 10      test val     more info https   git io vhEfc

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Here is a solution that works and includes validation notification fuctionality in a form   You can run it at this link  JAVASCRIPT   function        use strict      window addEventListener  load   function         var form   document getElementById  needs-validation        form addEventListener  submit   function event          if  form checkValidity       false            event preventDefault                  form classList add  was-validated          event preventDefault                         false        false           HTML   lt p class  title  gt       lt b gt Email validation lt  b gt     lt hr size  30px   gt   lt  p gt   lt br gt    lt form id  needs-validation  novalidate gt     lt p class  form text  gt Try it out  lt  p gt     lt div class  form-row  gt       lt div class  col-12  gt         lt input type  email  class  form-control  placeholder  Email Address  required gt           lt div class  invalid-feedback  gt            Please enter a valid email address           lt  div gt       lt  div gt     lt div class  row  gt       lt div class  col-12  gt         lt button type  submit             class  btn btn-default btn-block  gt Sign up now        lt  button gt       lt  div gt      lt  div gt   lt  form gt

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W3Schools gives a good simple and efficient script to validate an email     function validateEmail email        var atpos email indexOf           var dotpos email lastIndexOf           if  atpos  lt  1    dotpos  lt  atpos 2    dotpos 2  gt   email length            alert  Not a valid e-mail address            return false            return true      Note that you will have to remove spaces if there are any though  with something like this    replace    g       Source  JavaScript Form Validation

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Validation regex for email   var rex email          lt  gt             s           lt  gt             s                        0-9  1 3    0-9  1 3    0-9  1 3    0-9  1 3        a-zA-Z -0-9       a-zA-Z  2         if email            window plugins toast showShortBottom   Please enter the details     function a            console log  toast success      a          function b          else if  rex email test email         window plugins toast showShortBottom   Please enter the valid email id     function a            console log  toast success      a          function b

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Use this code inside your validator function   var emailID   document forms  formName    form element id   value  atpos   emailID indexOf       dotpos   emailID lastIndexOf       if  atpos  lt  1      dotpos - atpos  lt  2          alert  Please enter correct email ID       return false      Else you can use jQuery  Inside rules define   eMailId        required  true      email  true

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Wikipedia standard mail syntax    https   en wikipedia org wiki Email address Examples https   fr wikipedia org wiki Adresse  C3 A9lectronique Syntaxe exacte  function validMail mail        return        lt  gt             s           lt  gt             s                        lt  gt        s        0 1       lt  gt         s     2     d         test mail         VALID MAILS  validMail  Abc example com      Return true validMail  Abc example com       Return true validMail  Abc 10 42 0 1      Return true validMail  user localserver      Return true validMail  Abc 123 example com      Return true validMail  user mailbox department shipping example com      Return true validMail   very       lt  gt      VERY   very      very   unusual  strange example com      Return true validMail       amp     -            example com      Return true validMail      lt  gt                amp   -            a  example org      Return true validMail   Abc def  example com      Return true validMail   Fred Bloggs  example com      Return true validMail   Joe   Blow  example com      Return true validMail  Lo  c Accentu   voil   fr      Return true validMail      example org      Return true validMail  user  IPv6 2001 DB8  1       Return true     INVALID MAILS  validMail  Abc example com      Return false validMail  A b c example com      Return false validMail  a b c d e f g lt h gt i j k l example com      Return false validMail  just not right example com      Return false validMail  this is not allowed example com      Return false validMail  this  still  not  allowed example com      Return false validMail  john  doe example com      Return false validMail  john doe example  com      Return false   Show this test   https   regex101 com r LHJ9gU 1

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You can use this regex  from w3resource   not related to W3C       w     -   w     w     -   w       w 2 3      test emailValue   If you use Node you can use this in the back-end as well as the front-end  I don t know other back-end languages so I cannot evaluate for other use cases

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You can also try  var string    hmharsh3 gmail com  var exp      w      w    1  a-zA-Z  2    i alert exp test string

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You could also use RegExp  function validateEmail str        return new RegExp     w   -      w    w-       w   1      igm   test str      See the Regular Expressions guide on MDN for more info

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I was looking for a Regex in JS that passes all Email Address test cases    email example com Valid email firstname lastname example com  Email contains dot in the address field email subdomain example com Email contains dot with subdomain firstname lastname example com   Plus sign is considered valid character email 192 0 2 123 Domain is valid IP address email  192 0 2 123  Square bracket around IP address is considered valid    email    example com Quotes around email is considered valid 1234567890 example com Digits in address are valid email domain-one example Dash in domain name is valid         example com Underscore in the address field is valid email example name  name is valid Top Level Domain name email example co jp Dot in Top Level Domain name also considered valid  using co jp as example here  firstname-lastname example com Dash in address field is valid   Here we go    http   regexr com 3f07j  OR regex   Regex         lt  gt              s          lt  gt              s                   a-zA-Z0-9-    a-zA-Z0-9-

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Correct validation of email address in compliance with the RFCs is not something that can be achieved with a one-liner regular expression  An article with the best solution I ve found in PHP is What is a valid email address   Obviously  it has been ported to Java  I think the function is too complex to be ported and used in JavaScript  JavaScript node js port  https   www npmjs com package email-addresses   A good practice is to validate your data on the client  but double-check the validation on the server  With this in mind  you can simply check whether a string looks like a valid email address on the client and perform the strict check on the server   Here s the JavaScript function I use to check if a string looks like a valid mail address   function looksLikeMail str        var lastAtPos   str lastIndexOf           var lastDotPos   str lastIndexOf           return  lastAtPos  lt  lastDotPos  amp  amp  lastAtPos  gt  0  amp  amp  str indexOf          -1  amp  amp  lastDotPos  gt  2  amp  amp   str length - lastDotPos   gt  2       Explanation    lastAtPos  lt  lastDotPos  Last   should be before last   since   cannot be part of server name  as far as I know   lastAtPos  gt  0  There should be something  the email username  before the last    str indexOf          -1  There should be no    in the address  Even if   appears as the last character in email username  it has to be quoted so   would be between that   and the last   in the address  lastDotPos  gt  2  There should be at least three characters before the last dot  for example a b com   str length - lastDotPos   gt  2  There should be enough characters after the last dot to form a two-character domain  I m not sure if the brackets are necessary

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Wow there are a lot of answers that contain slightly different regular expressions  I ve tried some many that I ve got different results and a variety of different issues with all of them   For UI validation  I m good with the most basic check of looking for an   sign  It s important to note  that I always do server-side validation with a standard  validate email  that contains a unique link for the user to confirm their email address   if  email indexOf       gt  0    I have purposely chosen 0 even with zero-based as it also ensures there is a single character before the

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I have found this to be the best solution        s       s        s        It allows the following formats    1   prettyandsimple example com 2   very common example com 3   disposable style email with symbol example com 4   other email-with-dash example com 9           -           example org 6                        -            a  example org 7       example org  space between the quotes  8                  example com  Unicode characters in local part  9                                 com  Unicode characters in domain part  10  Pel   example com  Latin  11  d       pa  de    a d        Greek  12            Chinese  13            Japanese  14                - -                Cyrillic    It s clearly versatile and allows the all-important international characters  while still enforcing the basic anything anything anything format  It will block spaces which are technically allowed by RFC  but they are so rare that I m happy to do this

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Here is a very good discussion about using regular expressions to validate email addresses   Comparing E-mail Address Validating Regular Expressions   Here is the current top expression  that is JavaScript compatible  for reference purposes      -a-z0-9      amp                -a-z0-9      amp                 a-z0-9   -a-z0-9       -a-z0-9        aero arpa biz com coop edu gov info int mil museum name net org pro travel mobi  a-z  a-z     0-9  1 3    0-9  1 3    0-9  1 3    0-9  1 3      0-9  1 5     i

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Following Regex validations    No spacial characters before     -  and     should not be together after   No special characters after   2 characters must before   Email length should be less 128 characters     function validateEmail email    var chrbeforAt   email substr 0  email indexOf        if      trim email  length  gt  127         if  chrbeforAt length  gt   2            var re          lt  gt                      -   amp    s           lt  gt             s                       a-z0-9     a-z0-9-   a-z0-9        a-z0-9     a-z0-9-   a-z0-9                var re     a-z0-9     amp              -        a-z0-9     amp              -         a-z0-9     a-z0-9-   a-z0-9        a-z0-9     a-z0-9-   a-z0-9              return re test email         else           return false          else       return false

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Wow  there are lots of complexity here  If all you want to do is just catch the most obvious syntax errors  I would do something like this     S   S     It usually catches the most obvious errors that the user makes and assures that the form is mostly right  which is what JavaScript validation is all about

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HTML5 itself has email validation  If your browser supports HTML5 then you can use the following code   lt form gt  lt input type  quot email quot  placeholder  quot me example com quot  required gt       lt input type  quot submit quot  gt   lt  form gt   jsFiddle link From the HTML5 spec   A valid e-mail address is a string that matches the email production of the following ABNF  the character set for which is Unicode  email     1   atext    quot   quot     quot   quot  label     quot   quot  label   label     let-dig     ldh-str   let-dig      limited to a length of 63 characters by RFC 1034 section 3 5 atext      lt  as defined in RFC 5322 section 3 2 3  gt  let-dig    lt  as defined in RFC 1034 section 3 5  gt  ldh-str    lt  as defined in RFC 1034 section 3 5  gt   This requirement is a willful violation of RFC 5322  which defines a syntax for e-mail addresses that is simultaneously too strict  before the  quot   quot  character   too vague  after the  quot   quot  character   and too lax  allowing comments  whitespace characters  and quoted strings in manners unfamiliar to most users  to be of practical use here  The following JavaScript- and Perl-compatible regular expression is an implementation of the above definition     a-zA-Z0-9      amp               -    a-zA-Z0-9     a-zA-Z0-9-  0 61  a-zA-Z0-9         a-zA-Z0-9     a-zA-Z0-9-  0 61  a-zA-Z0-9

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function ValidateEmail mail       if     w     -   w     w     -   w       w 2 3      test myForm emailAddr value           return  true        alert  You have entered an invalid email address      return  false      Ref URL  https   www w3resource com javascript form email-validation php

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lt pre gt    The personal info part contains the following ASCII characters  1 Uppercase  A-Z  and lowercase  a-z  English letters  2 Digits  0-9   3 Characters          amp        -                     4 Character     period  dot or fullstop  provided that it is not the first or last character and it will not come one after the other     lt  pre gt   Example of valid email id   lt pre gt  yoursite ourearth com my ownsite ourearth org mysite you me net xxxx gmail com xxxxxx yahoo com  lt  pre gt   lt pre gt  xxxx ourearth com    is not present   xxxx  com my   tld  Top Level domain  can not start with dot        you me net   No character before     xxxx123 gmail b     b  is not a valid tld   xxxx  org org   tld can not start with dot        xxxx mysite org   an email should not be start with       xxxxx    gmail com   here the regular expression only allows character  digit  underscore and dash   xxxx  1234 yahoo com  double dots are not allowed  lt  pre gt    javascript mail code        function ValidateEmail inputText            var mailformat      w     -   w     w     -   w       w 2 3           if inputText value match mailformat             document form1 text1 focus        return true            else           alert  You have entered an invalid email address         document form1 text1 focus        return false

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This is how node-validator does it          w          amp        -                          w          amp        -                               a-zA-Z0-9     a-zA-Z0-9 -         0 61  a-zA-Z0-9       a-zA-Z0-9     a-zA-Z0-9 -        0 61  a-zA-Z0-9                01   d 1 2  2 0-4  d 25 0-5      3     01   d 1 2  2 0-4  d 25 0-5

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Most of the answers here are not linter friendly  it s a mess  Some of them are also out-dated  After a lot of time spending  I decided to use an external library named email-validator  install it easily by npm for example and import require it in your own project  https   www npmjs com package email-validator   NodeJs const validator   require  quot email-validator quot    validator validate  quot test email com quot       true    TypeScript JavaScript import   as EmailValidator from  email-validator   EmailValidator validate  quot test email com quot       true

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This question is more dificult to answer than seems at first sight   There were loads of people around the world looking for  the regex to rule them all  but the truth is that there are tones of email providers   What s the problem  Well   a z  gmail com cannot exists but it may exists an address like that through another provider  a  z provider com   Why   According to the RFC  https   en wikipedia org wiki Email address RFC specification   I ll take an excerpt to facilitate the lecture   The local-part of the email address may use any of these ASCII characters   - uppercase and lowercase Latin letters A to Z and a to z  - digits 0 to 9  - special characters      amp    -            - dot    provided that it is not the first or last character unless quoted  and provided also that it does not appear consecutively unless quoted  e g  John  Doe example com is not allowed but  John  Doe  example com is allowed   6  Note that some mail servers wildcard local parts  typically the characters following a plus and less often the characters following a minus  so fred bah domain and fred foo domain might end up in the same inbox as fred  domain or even as fred domain  This can be useful for tagging emails for sorting  see below  and for spam control  Braces   and   are also used in that fashion  although less often  - space and        lt  gt      characters are allowed with restrictions  they are only allowed inside a quoted string  as described in the paragraph below  and in addition  a backslash or double-quote must be preceded by a backslash   - comments are allowed with parentheses at either end of the local-part  e g  john smith comment  example com and  comment john smith example com are both equivalent to john smith example com    So  i can own an email address like that   A  z J0hn sm it  h comment example com co   If you try this address i bet it will fail in all or the major part of regex posted all across the net  But remember this address follows the RFC rules so it s fair valid   Imagine my frustration at not being able to register anywhere checked with those regex    The only one who really can validate an email address is the provider of the email address   How to deal with  so   It doesn t matter if a user adds a non-valid e-mail in almost all cases  You can rely on HTML 5 input type  email  that is running near to RFC  little chance to fail  HTML5 input type  email  info  https   www w3 org TR 2012 WD-html-markup-20121011 input email html  For example  this is an RFC valid email    very       lt  gt      VERY   very      very   unusual  strange example com   But the html5 validation will tell you that the text before   must not contain   or    chars for example  which is actually incorrect   Anyway  you should do this by accepting the email address and sending an email message to that email address  with a code link the user must visit to confirm validity   A good practice while doing this is the  enter your e-mail again  input to avoid user typing errors  If this is not enough for you  add a pre-submit modal-window with a title  is this your current e-mail    then the mail entered by the user inside an h2 tag  you know  to show clearly which e-mail they entered  then a  yes  submit  button

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Use the browser runtime to handle parsing the input by prepending a protocol and pass it to the URL API  trapping any errors and check the resulting username and hostname properties of the result  It will handle basically all transformations and possibilities  punycode of character sets  etc   This only establishes that the input is parsable  not that is valid--that is only possible through checking if the destination machine receives messages for that alias  This provides a close  imo reasonable  guess though  and can be expanded to be more specific and realistic if you re comfortable both maintaining it and also risking invalid rejections   Note it doesn t attempt to address IPv4 or IPv6 addresses  simply the broad range of customer-facing scenarios using a domain    function validEmail email          var  0  url  isValid   false  emailPatternInput          1 64       4 253     emailPatternUrl          1 64   a-z  a-z0-9  -  3 252   i      email   email trim        try          url   new URL  http     email            0      url username    url hostname            isValid   emailPatternInput test  email            if  isValid  throw  invalid email pattern on input     email          isValid   emailPatternUrl test   0            if  isValid  throw  invalid email pattern on url      0          console log  email looks legit    email   checking url-parts      0     email    -SAME-   0           catch err           console error  probably not an email address     email     err              return isValid       user this              stuff things    user that host com    Jean Fran  ois anydomain museum                                        not  really    no   forEach email  gt console log validEmail email   email      This is the both the simplest and most generally permissive example I can come up with  Please edit it in cases where it can be made to be more accurate while maintain its simplicity and reasonable generally permissive validity   Also see MDN URL docs URL  window URL and Nodejs for URL APIs

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Using regular expressions is probably the best way  You can see a bunch of tests here  taken from chromium  function validateEmail email        const re          lt  gt             s  quot         lt  gt             s  quot         quot    quot         0-9  1 3    0-9  1 3    0-9  1 3    0-9  1 3        a-zA-Z -0-9       a-zA-Z  2            return re test String email  toLowerCase        Here s the example of regular expresion that accepts unicode  const re          lt  gt            s   quot         lt  gt            s   quot          quot     quot         lt  gt            s   quot          lt  gt            s   quot   2     i   But keep in mind that one should not rely only upon JavaScript validation  JavaScript can easily be disabled  This should be validated on the server side as well  Here s an example of the above in action   x000D   x000D  function validateEmail email      const re          lt  gt             s           lt  gt             s                        0-9  1 3    0-9  1 3    0-9  1 3    0-9  1 3        a-zA-Z -0-9       a-zA-Z  2          return re test email      function validate       const  result       result      const email       email   val       result text         if  validateEmail email          result text email     is valid            result css  color    green        else        result text email     is not valid            result css  color    red          return false         validate   on  click   validate   x000D   lt script src  https   ajax googleapis com ajax libs jquery 2 1 1 jquery min js  gt  lt  script gt    lt form gt     lt p gt Enter an email address  lt  p gt     lt input id  email  gt     lt button type  submit  id  validate  gt Validate  lt  button gt   lt  form gt    lt h2 id  result  gt  lt  h2 gt  x000D   x000D   x000D

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There s something you have to understand the second you decide to use a regular expression to validate emails  It s probably not a good idea  Once you have come to terms with that  there are many implementations out there that can get you halfway there  this article sums them up nicely   In short  however  the only way to be absolutely  positively sure that what the user entered is in fact an email is to actually send an email and see what happens  Other than that it s all just guesses

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If you are using ng-pattern and material this does the job    vm validateEmail      a-zA-Z0-9    1       a-zA-Z  2           a-zA-Z  2   a-zA-Z  3

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I ve mixed  mevius and  Boldewyn Code to Create this ultimate code for email verification using JavaScript    x000D   x000D  function ValidateEmail email   x000D    x000D    var re          lt  gt              s          lt  gt              s                     0-9  1 3    0-9  1 3    0-9  1 3    0-9  1 3       a-zA-Z -0-9       a-zA-Z  2        x000D    x000D    var input   document createElement  input    x000D    x000D    input type    email   x000D    input value   email  x000D    x000D    return typeof input checkValidity     function    input checkValidity     re test email   x000D    x000D    x000D   x000D   x000D    I have shared this code on my blog here

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If you get this error  Using regular expressions is security-sensitive   Then here is what you are looking for This solution is free from   Regular expression Denial of Service  ReDoS     Regex to validate emails without  ReDoS        a-z0-9          na-z0-9  2     s       s        s    a-z0-9      Please let me know if this solutions works for you  Thanks

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lt form name  validation  onSubmit  return checkbae    gt      Please input a valid email address  lt br   gt        lt input type  text  size 18 name  emailcheck  gt       lt input type  submit  value  Submit  gt   lt  form gt    lt script language  JavaScript1 2  gt      var testresults     function checkemail            var str   document validation emailcheck value         var filter        w-         w-            w-       w  w-  0 66      a-z  2 6       a-z  2      i         if  filter test str               testresults   true         else               alert  Please input a valid email address                testresults   false                   return  testresults         lt  script gt    lt script gt      function checkbae            if  document layers    document getElementById    document all              return checkemail           else             return true        lt  script gt

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Here is the recommended Regex pattern for HTML5 on MDN      Browsers that support the email input type automatically provide validation to ensure that only text that matches the standard format for Internet e-mail addresses is entered into the input box  Browsers that implement the specification should be using an algorithm equivalent to the following regular expression       a-zA-Z0-9      amp               -    a-zA-Z0-9     a-zA-Z0-9-  0 61   a-zA-Z0-9         a-zA-Z0-9     a-zA-Z0-9-  0 61  a-zA-Z0-9          https   developer mozilla org en-US docs Web HTML Element input email Validation

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Just for completeness  here you have another RFC 2822 compliant regex  The official standard is known as RFC 2822  It describes the syntax that valid email addresses must adhere to  You can  but you shouldn t     read on  implement it with this regular expression      a-z0-9     amp              -        a-z0-9     amp              -      quot      x01- x08 x0b x0c x0e- x1f x21 x23- x5b x5d- x7f      x01- x09 x0b x0c x0e- x7f    quot          a-z0-9     a-z0-9-   a-z0-9        a-z0-9     a-z0-9-   a-z0-9            25 0-5  2 0-4  0-9   01   0-9  0-9       3    25 0-5  2 0-4  0-9   01   0-9  0-9    a-z0-9-   a-z0-9       x01- x08 x0b x0c x0e- x1f x21- x5a x53- x7f      x01- x09 x0b x0c x0e- x7f              We get a more practical implementation of RFC 2822 if we omit the syntax using double quotes and square brackets  It will still match 99 99  of all email addresses in actual use today   a-z0-9     amp              -        a-z0-9     amp              -         a-z0-9     a-z0-9-   a-z0-9        a-z0-9     a-z0-9-   a-z0-9    A further change you could make is to allow any two-letter country code top level domain  and only specific generic top level domains  This regex filters dummy email addresses like asdf adsf adsf  You will need to update it as new top-level domains are added   a-z0-9     amp              -        a-z0-9     amp              -         a-z0-9     a-z0-9-   a-z0-9           A-Z  2  com org net gov mil biz info mobi name aero jobs museum  b So even when following official standards  there are still trade-offs to be made  Don t blindly copy regular expressions from online libraries or discussion forums  Always test them on your own data and with your own applications   Emphasis mine

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Here s how I do it  I m using match   to check for the standard email pattern and I m adding a class to the input text to notify the user accordingly  Hope that helps    x000D   x000D    document  ready function    x000D        submit   on  click   function    x000D        var email       email   val    x000D        var pat      w     -   w     w     -   w       w 2 3       x000D        if  email match pat    x000D              email   x000D             addClass  input-valid    x000D          return false  x000D          else   x000D              email   x000D            addClass  input-error   x000D             val      x000D          return false  x000D          x000D        x000D      x000D   input-error   x000D    border  1px solid red  x000D    color  red  x000D    x000D   x000D   input-valid   x000D    border  1px solid green  x000D    color  green  x000D    x000D   lt script src  https   cdnjs cloudflare com ajax libs jquery 3 3 1 jquery min js  gt  lt  script gt  x000D   lt form gt  x000D       lt input type  text  id  email  placeholder  name service xx  class    gt  x000D       lt input type  submit  id  submit  value  Send   gt  x000D   lt  form gt  x000D   x000D   x000D

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My knowledge of regular expressions is not that good  That s why I check the general syntax with a simple regular expression first and check more specific options with other functions afterwards  This may not be not the best technical solution  but this way I m way more flexible and faster   The most common errors I ve come across are spaces  especially at the beginning and end  and occasionally a double dot   function check email val       if  val match   S   S    S         Jaymon s   Squirtle s solution            Do something         return false            if  val indexOf       -1    val indexOf        -1              Do something         return false            return true     check email  check thiscom       Returns false check email  check this  com       Returns false check email   check this com       Returns false check email  check this com       Returns true

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Do this    a-zA-Z0-9     amp              -        a-zA-Z0-9     amp              -         a-zA-Z0-9     a-zA-Z0-9-   a-zA-Z0-9        a-zA-Z0-9     a-zA-Z0-9-   a-zA-Z0-9      Why   It s based on RFC 2822  which is a standard ALL email addresses MUST adhere to   And I m not sure why you d bother with something  simpler     you re gonna copy and paste it anyway     Often when storing email addresses in the database I make them lowercase and  in practice  regexs can usually be marked case insensitive  In those cases this is slightly shorter    a-z0-9     amp              -        a-z0-9     amp              -         a-z0-9     a-z0-9-   a-z0-9        a-z0-9     a-z0-9-   a-z0-9      Here s an example of it being used in JavaScript  with the case insensitive flag i at the end    var emailCheck    a-z0-9     amp              -        a-z0-9     amp              -         a-z0-9     a-z0-9-   a-z0-9        a-z0-9     a-z0-9-   a-z0-9     i  console log  emailCheck test  some body domain co uk        Note  Technically some emails can include quotes in the section before the   symbol with escape characters inside the quotes  so your email user can be obnoxious and contain stuff like   and       as long as it s written in quotes   NOBODY DOES THIS EVER  It s obsolete  But  it IS included in the true RFC 2822 standard  and omitted here   More info  http   www regular-expressions info email html

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I add my Regex - i solved for me more little issues like characters from other languages or capital letters     a-zA-Z0-9  a-zA-Z0-9-        a-zA-Z   a-zA-Z0-9   a-zA-Z0-9-   a-zA-Z0-9     a-zA-Z0-9  2 10       a-zA-Z  2 10

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b a-z   w d       w    a-z  2  a-z      a-z   2  s   It allows   abcxyz123 qwert com     abc123xyz asdf co in    abc1 xyz1 gmail1 com    abc xyz gmail com in

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Here s a simple  regex that would just check for the basic format of an email e g   X Y C    S   S    S

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Here is a function I use for front end email validation   The Regular Expression came from parsley js    lt  DOCTYPE html gt   lt html gt   lt head gt       lt title gt Our Company lt  title gt       lt style gt           form-style               color   ccc                 lt  style gt   lt  head gt   lt body gt       lt h1 gt Email Validation Form Example lt  h1 gt       lt input type  text  name  email  id  emailInput  class  form-style  gt       lt script gt          function validateEmail emailAddress                var regularExpression         a-z   d        amp       -                  u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF        a-z   d        amp       -                  u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF          x22      x20  x09    x0d x0a     x20  x09        x01- x08 x0b x0c x0e- x1f x7f   x21   x23- x5b    x5d- x7e    u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF         x01- x09 x0b x0c x0d- x7f    u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF          x20  x09    x0d x0a     x20  x09      x22        a-z   d   u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF      a-z   d   u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF    a-z   d -          u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF     a-z   d   u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF           a-z    u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF      a-z    u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF    a-z   d -          u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF     a-z    u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF     2 6   i               return regularExpression test emailAddress                      function showEmailValidationState event                if  validateEmail event target value                     document getElementById  emailInput   style color    black                               document getElementById  emailInput   addEventListener  keyup   showEmailValidationState        lt  script gt   lt  body gt   lt  html gt

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Use the regular expression       a-z  a-zA-Z0-9        a-zA-Z  a-zA-Z0-9        a-z  a-zA-Z-0-9     a-z      a-z         Example   function validateEmail email        var re      a-z  a-zA-Z0-9        a-zA-Z  a-zA-Z0-9        a-z  a-zA-Z-0-9     a-z      a-z            return re test email       It should allow only

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I am using this function           param     email     export const validateEmail   email   gt        return new RegExp    w-      w-        w-   gm  test email

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If you want something a human can read and maintain  I would recommend Masala Parser  I m one of the creators of it    import  C Streams  from   masala parser   const illegalCharset       u00A0 n t   const extendedIllegalCharset   illegalCharset             Assume  nicolas internal masala co uk  export function simpleEmail          return C charNotIn illegalCharset  rep       nicolas           then C char                then subDns        internal masala co            then C charNotIn extendedIllegalCharset  rep       uk           eos       Must be end of the char stream       x internal masala co uk   gt  extract  internal masala co   function  subDns         return C charNotIn extendedIllegalCharset  rep   then C char       rep      function validateEmail email string        console log email           simpleEmail   parse Streams ofString email   isAccepted          validateEmail  nicolas internal masala co uk       True validateEmail  nz co        False  trailing       If you want to accept the ultimate ugly email version  you can add in quotes in the first part    function inQuote         return C char               then C notChar      rep             then C char          function allEmail          return inQuote   or C charNotIn illegalCharset            rep      repeat  inQuote or anyCharacter           then C char                then subDns             then C charNotIn extendedIllegalCharset  rep             eos      Must be end of the character stream            Create a structure          map function  characters    return    email  characters join                   nicolas  love-quotes  masala co uk  is officially valid  but should it be in your system   At least with Masala  you give yourself a chance to understand it  And so for the next year  colleague

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It s hard to get an email validator 100  correct  The only real way to get it correct would be to send a test email to the account  That said  there are a few basic checks that can help make sure that you re getting something reasonable   Some things to improve   Instead of new RegExp  just try writing the regexp out like this   if  reg test         Second  check to make sure that a period comes after the   sign  and make sure that there are characters between the  s and periods

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You may try RegExp   x000D   x000D  function isValidEmail  value     x000D   return     w -         a-zA-Z0-9   -     a-zA-z0-9  2 5    test  value    x000D    x000D   x000D  console log  isValidEmail  mymail mydomain com     x000D   x000D   x000D

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for email validation you can create your custom function and use regex syntax for validate email   function validateEmail email           var reg       A-Za-z0-9  -         A-Za-z0-9  -         A-Za-z  2 4                your custom code here to check your email address

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Apparently  that s it        w         amp        -                         w         amp        -                          a-z0-9  1  a-z0-9 -  0 62  a-z0-9  1    a-z       a-z  2 6     d 1 3     3  d 1 3     d 1 5      i   Taken from http   fightingforalostcause net misc 2006 compare-email-regex php on Oct 1  10   But  of course  that s ignoring internationalization

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In my case  I wanted to avoid   and   that s why I have used another solution  function validEmail email     const regex              w-            w      w     w       W        return regex test email       x000D   x000D  function validEmail email     const regex              w-            w      w     w       W        return regex test email      const emails      pio pio factory com     pio pio factory com    pio  pio factory com    pio  pio factory com    pio pio  factory com    pio pio factory c om    pio pio factory c om    pio  pio factory com     for const email of emails     document write email       validEmail email    lt  br gt       x000D   x000D   x000D

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This works for me   function Email mail     if     w     -   w     w     -   w       w 2 3      test myForm emailAddr value           return  true          alert  Invalid email address        return  false

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function validatecontactEmail email       if     w     -   w     w     -   w       w 2 3      test email               return  true               return  false

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There are some complex RegEx written here  that also works   I tested this one and it works too    a-zA-Z0-9         a-zA-Z0-9       a-zA-Z  2 6    Please test this here   http   www regextester com  fam 97334  Hope this helps

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Following Regex validations    No spacial characters before     -  and     should not be together after    No special characters after   2 characters must before   Email length should be less 128 characters  function validateEmail email        var chrbeforAt   email substr 0  email indexOf            if      trim email  length  gt  127             if  chrbeforAt length  gt   2                var re          lt  gt                      -   amp    s           lt  gt             s                       a-z0-9     a-z0-9-   a-z0-9        a-z0-9     a-z0-9-   a-z0-9                  return re test email             else               return false                  else           return false

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In contrast to squirtle  here is a complex solution  but it does a mighty fine job of validating emails properly   function isEmail email         return       a-z   d        amp       -                  u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF        a-z   d        amp       -                  u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF          x22      x20  x09    x0d x0a     x20  x09        x01- x08 x0b x0c x0e- x1f x7f   x21   x23- x5b    x5d- x7e    u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF         x01- x09 x0b x0c x0d- x7f    u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF          x20  x09    x0d x0a     x20  x09      x22        a-z   d   u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF      a-z   d   u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF    a-z   d -          u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF     a-z   d   u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF           a-z    u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF      a-z    u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF    a-z   d -          u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF     a-z    u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF      i test email        Use like so   if  isEmail  youremail yourdomain com     console log  This is email is valid

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Html form call function name at submit button       lt form name  quot form1 quot  action  quot   quot  gt        lt input type  text  name  text1   gt       lt input type  quot submit quot  name  quot submit quot  value  quot Submit quot       onclick  quot ValidateEmail document form1 text1  quot   gt      lt  from gt          Write the function name ValidateEmail below       lt script gt       function ValidateEmail inputText          var mailformat      a-zA-Z0-9      amp              -    a-zA-Z0-9-        a-zA-Z0-9-            if inputText value match mailformat             alert  quot Valid email address  quot        document form1 text1 focus        return true            else          alert  quot You have entered an invalid email address  quot        document form1 text1 focus        return false                  lt  script gt

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This regexp prevents duplicate domain names like abc abc com com com com  it will allow only domain two time like abc abc co in  It also does not allow statring from number like 123abc abc com    regexp      a-zA-Z     a-zA-Z0-9   -        a-zA-Z        com co in org net edu info gov vekomy      com co in org net edu info gov          All The Best

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Search for the   sign in the input field

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A solution that does not check the existence of the TLD is incomplete   Almost all answers to this questions suggest using Regex to validate emails addresses  I think Regex is only good for a rudimentary validation  It seems that the checking validation of email addresses is actually two separate problems   1- Validation of email format  Making sure if the email complies with the format and pattern of emails in RFC 5322 and if the TLD actually exists  A list of all valid TLDs can be found here   For example  although the address example example ccc will pass the regex  it is not a valid email  because ccc is not a top-level domain by IANA   2- Making sure the email actually exists  For doing this  the only option is to send the users an email

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The best practice is to either use HTML5 built-in email tag    lt input type  email  name  email  gt    or the common email syntax as recognizing   and   from the string is given below      a-zA-Z0-9  -     a-zA-Z0-9 -     a-zA-Z0-9 -          Note that this would still produce invalid email that will still match   the regex  its almost impossible to catch them all but this will   improve the situation a little

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You should not use regular expressions to validate an input string to check if it s an email  It s too complicated and would not cover all the cases   Now since you can only cover 90  of the cases  write something like   function isPossiblyValidEmail txt       return txt length  gt  5  amp  amp  txt indexOf      gt 0      You can refine it  For instance   aaa   is valid  But overall you get the gist  And don t get carried away    A simple 90  solution is better than 100  solution that does not work    The world needs simpler code

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You cold use https   github com chriso validator js and simply do   var validator   require  validator     validator isEmail  foo bar com        gt  true   Note that this can work on the client

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the best one  D  RFC-friendly  amp  no error  too complex      function    isMail mail        pattuser       A-Z0-9    -    amp                     A-Z0-9    -    amp                 i      pattdomain       A-Z0-9-        A-Z0-9-      A-Z  2 9     i       tab   mail split           if  tab length    2          return false      return  pattuser test tab 0    amp  amp  pattdomain test tab 1

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These will work with the top used emails they match exactly the rules of each one    Gmail     a-z            a-z      4 28  a-z0-9  gmail com  i  Yahoo     a-z             w      3 30   w  yahoo com  i  Outlook Hotmail    a-z             w      0 62   w   outlook com hotmail com   i

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function validateEmail elementValue               var emailPattern      a-zA-Z0-9     a-zA-Z0-9    a-zA-Z0-9     a-zA-Z  2 4           return emailPattern test elementValue               It returns true if the email address is valid  Otherwise  it will return false

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I m really looking forward to solve this problem  So I modified email validation regular expression above    Original        lt  gt              s          lt  gt              s                     0-9  1 3    0-9  1 3    0-9  1 3    0-9  1 3       a-zA-Z -0-9       a-zA-Z  2       Modified        lt  gt             s           lt  gt             s                        lt  gt        s        0 1      lt  gt         s     2        to pass the examples in Wikipedia Email Address   And you can see the result in here

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The regular expression provided by Microsoft within ASP NET MVC is      w-       w-       a-z0-9-      a-z0-9-        a-z  2 6    d 1 3     3  d 1 3     d 4        Which I post here in case it s flawed - though it s always been perfect for my needs

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I d like to add a short note about non-ASCII characters  Rnevius s  and co   solution is brilliant  but it allows to add Cyrillic  Japanese  Emoticons and other unicode symbols which may be restricted by some servers   The code below will print true though it contains UTF-8 character      x000D   x000D  console log         lt  gt              s          lt  gt              s                     0-9  1 3    0-9  1 3    0-9  1 3    0-9  1 3       a-zA-Z -0-9       a-zA-Z  2       test     example org    x000D   x000D   x000D    In my case all non-ASCII symbols are prohibited so I have modified the original expression to exclude all characters above U 007F    x000D   x000D         u0080- uffff lt  gt              s          u0080- uffff lt  gt              s                     0-9  1 3    0-9  1 3    0-9  1 3    0-9  1 3       a-zA-Z -0-9       a-zA-Z  2       x000D   x000D   x000D    Maybe this will help someone to prevent undesired behaviour

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If you want to use Jquery and want to have modern approach then use JQuery input mask with validation    http   bseth99 github io projects jquery-ui 5-jquery-masks html   Demo on how simple jquery input mask is here  http   codepen io anon pen gpRyBp  Example of simple input mask for date forexample NOT full validation    lt input id  date  type  text  placeholder  YYYY-MM-DD   gt    and the script        date   mask  9999-99-99   placeholder  YYYY-MM-DD

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All email addresses contain an  at   i e     symbol  Test that necessary condition  email indexOf  quot   quot    gt  0  Don t bother with anything more complicated  Even if you could perfectly determine whether an email is RFC-syntactically valid  that wouldn t tell you whether it belongs to the person who supplied it  That s what really matters  To test that  send a validation message

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If you re using Closure you can use the built-in goog format EmailAddress type      http   docs closure-library googlecode com git class goog format EmailAddress html   For example   goog format EmailAddress isValidAddrSpec  blah blah com     Note that by reading the source  linked above  you can see the comments state that IDN are not supported and that it only aims to cover most addresses      This is a fairly naive implementation  but it covers 99  of use cases     For more details  see http   en wikipedia org wiki Email address Syntax    TODO mariakhomenko   we should also be handling i18n domain names as per    http   en wikipedia org wiki Internationalized domain name

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