Email validation using jQuery

Question

I m new to jQuery and was wondering how to use it to validate email addresses

User · Answer

Another simple and complete option    lt input type  text  id  Email   gt   lt div id  ClasSpan  gt  lt  div gt      lt input id  ValidMail  type  submit   value  Valid   gt      function IsEmail email        var regex       a-zA-Z0-9   -        a-zA-Z0-9-         a-zA-Z0-9  2 4           return regex test email          ValidMail   click function             span     ClasSpan   empty   remove        if  IsEmail     Email   val                 aqui mi sentencia                   else               ClasSpan   append   lt span gt Please enter a valid email lt  span gt                 Email   keypress function                     span     itemspan   empty   remove

User · Answer

http   so devilmaycode it jquery-validate-e-mail-address-regex  using new regex added support for Address tags    sign     x000D   x000D  function isValidEmailAddress emailAddress    x000D      var pattern       a-z d     amp     -            u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF      a-z d     amp     -            u00A0- uD7FF uF900- uFDCF uFDF0- uFFEF            t   r n     t       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         t   r n     t          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  x000D      return pattern test emailAddress   x000D     x000D   x000D   x000D    if   isValidEmailAddress  emailaddress          do stuff here  email is invalid         this was provided by user Luca Filosofi in this answer this answer

User · Answer

checkRegexp  email        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   eg  ui jquery com       Refernce   JQUERY UI WEBSITE

User · Answer

I would use the jQuery validation plugin for a few reasons   You validated  ok great  now what   You need to display the error  handle erasing it when it is valid  displaying how many errors total perhaps   There are lots of things it can handle for you  no need to re-invent the wheel   Also  another huge benefit is it s hosted on a CDN  the current version at the time of this answer can be found here  http   www asp net ajaxLibrary CDNjQueryValidate16 ashx  This means faster load times for the client

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lt script type  text javascript  gt        document  ready function               form error   hide              submit   click function               var name       name   val               var email       email   val               var phone       phone   val               var message       message   val               if name                          name   next   show                  return false                            if email                           email   next   show                   return false                            if IsEmail email   false                       invalid email   show                    return false                             if phone                            phone   next   show                    return false                            if message                            message   next   show                    return false                              ajax call php page               post  send php       contactform   serialize     function response                    contactform   fadeOut  slow  function                        success   html response                       success   fadeIn  slow                                                     return false                                function IsEmail email            var regex       a-zA-Z0-9    -          a-zA-Z0-9 -         a-zA-Z0-9  2 4               if  regex test email                return false           else             return true                       lt  script gt    lt form action    method  post  id  contactform  gt                               lt table class  contact-table  gt                                 lt tr gt                                   lt td gt  lt label for  name  gt Name   lt  label gt  lt  td gt                                   lt td class  name  gt   lt input name  name  id  name  type  text  placeholder  Please enter your name  class  contact-input  gt  lt span class  form error  gt Please enter your name lt  span gt  lt  td gt                                 lt  tr gt                                 lt tr gt                                   lt td gt  lt label for  email  gt Email   lt  label gt  lt  td gt                                   lt td class  email  gt  lt input name  email  id  email  type  text  placeholder  Please enter your email  class  contact-input  gt  lt span class  form error  gt Please enter your email lt  span gt                                     lt span class  form error  id  invalid email  gt This email is not valid lt  span gt  lt  td gt                                 lt  tr gt                                 lt tr gt                                   lt td gt  lt label for  phone  gt Phone   lt  label gt  lt  td gt                                   lt td class  phone  gt  lt input name  phone  id  phone  type  text  placeholder  Please enter your phone  class  contact-input  gt  lt span class  form error  gt Please enter your phone lt  span gt  lt  td gt                                 lt  tr gt                                 lt tr gt                                   lt td gt  lt label for  message  gt Message   lt  label gt  lt  td gt                                   lt td class  message  gt  lt textarea name  message  id  message  class  contact-input  gt  lt  textarea gt  lt span class  form error  gt Please enter your message lt  span gt  lt  td gt                                 lt  tr gt                                 lt tr gt                                   lt td gt  lt  td gt                                   lt td gt                                     lt input type  submit  class  contactform-buttons  id  submit value  Send    gt                                     lt input type  reset  class  contactform-buttons  id    value  Clear    gt                                   lt  td gt                                 lt  tr gt                               lt  table gt        lt  form gt        lt div id  success  style  color red   gt  lt  div gt

User · Answer

I would recommend Verimail js  it also has a JQuery plugin   Why  Verimail supports the following    Syntax validation  according to RFC 822  IANA TLD validation Spelling suggestion for the most common TLDs and email domains Deny temporary email account domains such as mailinator com   So besides validation  Verimail js also gives you suggestions  So if you type an email with the wrong TLD or domain that is very similar to a common email domain  hotmail com  gmail com  etc   it can detect this and suggest a correction   Examples    test gnail con -  Did you mean test gmail com  test hey nwt -  Did you mean test hey net  test hottmail com -  Did you mean test hotmail com    And so on    To use it with jQuery  just include verimail jquery js on your site and run the function below      input email-address   verimail       messageElement   p status-message        The message element is an element in which a message will be shown  This can be everything from  Your email is invalid  to  Did you mean          If you have a form and want to restrict it so that it cannot be submitted unless the email is valid  then you can check the status using the getVerimailStatus-function as shown below   if    input email-address   getVerimailStatus    lt  0          Invalid  else         Valid     This function returns an integer status code according to the object Comfirm AlphaMail Verimail Status  But the general rule of thumb is that any codes below 0 is codes indicating errors

User · Answer

As mentioned above  this one is good enough if you ask me   var regex       a-zA-Z0-9   -        a-zA-Z0-9-         a-zA-Z0-9  2 4         But if you don t want the domain ending   com   nu   net etc  to contain numbers  which is my prefered choice  the edited version would be     var regex       a-zA-Z0-9   -        a-zA-Z0-9-         a-zA-Z  2 4

User · Answer

A simplified one I ve just made  does what I need it to  Have limited it to just alphanumeric  period  underscore and      lt input onKeyUp  testEmailChars this    gt  lt span id  a  gt  lt  span gt  function testEmailChars el       var email     el  val        if      a-zA-Z0-9   -     test email   true                a   html  valid          else               a   html  not valid              Made with help from others

User · Answer

if you are using jquery validation I created a method emailCustomFormat that used  regex for my custm format you can change it to meet your requirments jQuery validator addMethod  quot emailCustomFormat quot   function  value  element            return this optional element          w-         w-        w-  2 4      test value          abp localization localize  quot FormValidationMessageEmail quot       localized message based on current language  then you can use it like this    quot  myform quot   validate     rules        field          required  true        emailCustomFormat   true                this regex accept abc abc abc  abc abc abcd but not this abc abc   abc abc a  abc abc abcde hope this helps you

User · Answer

function validateEmail emailaddress        var emailReg        w-        w-        w-  2 4            if  emailReg test emailaddress               alert  Please enter valid email id

User · Answer

For thoose who want to use a better maintainable solution than disruptive lightyear-long RegEx matches  I wrote up a few lines of code  Thoose who want to save bytes  stick to the RegEx variant     This restricts    No   in string No dot in string More than 2 dots after   Bad chars in the username  before    More than 2   in string Bad chars in domain Bad chars in subdomain Bad chars in TLD TLD - addresses   Anyways  it s still possible to leak through  so be sure you combine this with a server-side validation   email-link verification   Here s the JSFiddle     validate email  var emailInput       email   val        emailParts   emailInput split           text    Enter a valid e-mail address       at least one    catches error if  emailParts 1     null    emailParts 1           emailParts 1     undefined          yourErrorFunc text      else          split domain  subdomain and tld if existent     var emailDomainParts   emailParts 1  split              at least one    dot   catches error     if  emailDomainParts 1     null    emailDomainParts 1           emailDomainParts 1     undefined              yourErrorFunc text            else              more than 2    dots  in emailParts 1          if   emailDomainParts 3     null     emailDomainParts 3            emailDomainParts 3     undefined                  yourErrorFunc text               else                  email user             if     a-z0-9     amp    -            i test emailParts 0                      yourErrorFunc text                  else                      double                   if   emailParts 2     null     emailParts 2            emailParts 2     undefined                              yourErrorFunc text                       else                           domain                      if     a-z0-9-  i test emailDomainParts 0                                yourErrorFunc text                            else                               check for subdomain                          if  emailDomainParts 2     null    emailDomainParts 2           emailDomainParts 2     undefined                                     TLD                              if     a-z  i test emailDomainParts 1                                        yourErrorFunc text                                    else                                     yourPassedFunc                                                                 else                                   subdomain                              if     a-z0-9-  i test emailDomainParts 1                                        yourErrorFunc text                                    else                                        TLD                                   if     a-z  i test emailDomainParts 2                                             yourErrorFunc text                                         else                                          yourPassedFunc

User · Answer

use this   if   this hasClass  tb-email          var email    this val        var txt       a-zA-Z0-9    -          a-zA-Z0-9 -         a-zA-Z0-9  2 4           if   txt test email             e preventDefault             this addClass  error          else            this removeClass  error

User · Answer

If you have a basic form  just make the input type of email       lt input type  email  required gt   This will work for browsers that use HTML5 attributes and then you do not even need JS  Just using email validation even with some of the scripts above will not do much since   some email com so em co my fakemail net  etc    Will all validate as  real  emails  So you would be better off ensuring that the user has to enter their email address twice to make sure that they put the same one in  But to guarantee that the email address is real would be very difficult but very interesting to see if there was a way  But if you are just making sure that it is an email  stick to the HTML5 input   FIDDLE EXAMPLE  This works in FireFox and Chrome  It may not work in Internet Explorer    But internet explorer sucks  So then there s that

User · Answer

Look at http    bassistance de jquery-plugins jquery-plugin-validation   It is nice jQuery plugin  which allow to build powerfull validation system for forms  There are some usefull samples here  So  email field validation in form will look so        myform   validate     rules        field          required  true        email  true                 See Email method documentation for details and samples

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You can create your own function    function emailValidate email       var check        email      if  check search      gt  0  amp  amp  check search       gt  0           if check search      lt check split      1  search       check search       return true          else return false      else return false     alert emailValidate  your email yahoo com

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This performs a more thorough validation  for example it checks against successive dots in the username such as john  doe example com   function isValidEmail email        return    a-z0-9    -    a-z0-9       a-z0-9   - a-z0-9         a-z  2 4    test email           amp  amp         1 64    4 64        6 100       test email       See validate email address using regular expression in JavaScript

User · Answer

function isValidEmail emailText        var pattern   new RegExp       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       return pattern test emailText        Use Like This    if   isValidEmail myEmail         do things if myEmail is valid

User · Answer

Use jquery validate js it have Microsoft ajax CDN       form   validate       rules            name                required true              maxlength 40                      email                required true              email true    for validate email             maxlength 100                      message                required true

User · Answer

You can use regular old javascript for that   function isEmail email      var regex       a-zA-Z0-9   -        a-zA-Z0-9-         a-zA-Z0-9  2 4         return regex test email

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lt  -- Dont forget to include the jQuery library here -- gt   lt script type  text javascript  src  jquery-1 3 2 min js  gt  lt  script gt   lt script type  text javascript  gt     document  ready function              validate   keyup function             var email       validate   val             if email    0                        if isValidEmailAddress email                                     validEmail   css                        background-image    url  validYes png                                      else                       validEmail   css                        background-image    url  validNo png                                                else                   validEmail   css                    background-image    none                                                    function isValidEmailAddress emailAddress        var pattern   new RegExp        w- s        w-         w-          w- s       w-         w-              w-       w  w-  0 66      a-z  2 6       a-z  2              25 0-5    2 0-4  0-9    1 0-9  2     0-9  1 2       25 0-5  2 0-4  0-9  1 0-9  2   0-9  1 2      2  25 0-5  2 0-4  0-9  1 0-9  2   0-9  1 2        i       return pattern test emailAddress       lt  script gt    lt style gt       validEmail               margin-top  4px          margin-left  9px          position  absolute          width  16px          height  16px              text               font-family  Arial  Tahoma  Helvetica         lt  style gt        lt title gt Live Email Validation with jQuery Demo lt  title gt   lt  head gt   lt body gt       lt div class  text  gt  lt h1 gt Reynoldsftw com - Live Email Validation lt  h1 gt  lt h2 gt Type in an email address in the box below  lt  h2 gt  lt  div gt       lt div gt  lt input type  text  id  validate  width  30  gt  lt span id  validEmail  gt  lt  span gt  lt  div gt       lt div class  text  gt  lt P gt More script and css style     www htmldrive net           Source htmldrive com

User · Answer

jQuery Function to Validate Email  I really don   t like to use plugins  especially when my form only has one field that needs to be validated  I use this function and call it whenever I need to validate an email form field    function validateEmail  email      var emailReg        w-        w-        w-  2 4         return emailReg test   email        and now to use this   if   validateEmail emailaddress        do stuff here        Cheers

User · Answer

I take this code from jqvalidate version 1 11 0 and implemented in the version 1 16 0 as aditional method  It works              jQuery validator addMethod  strictemail   function value  element                        var valid         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 value                       return valid                      Escribe un correo v u00e1lido                   And and in the email rule               correo                     required   Por favor ingresa tu correo                   email   Escribe un correo v u00e1lido                   strictemail  Escribe un correo v u00e1lido

User · Answer

Landed here     ended up here  https   html spec whatwg org multipage forms html valid-e-mail-address     which provided the following regex      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             which I found thanks to a note on the jQuery Validation plugin readme   https   github com jzaefferer jquery-validation blob master README md reporting-an-issue  So  the updated version of  Fabian s answer would be   function IsEmail email      var regex      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           return regex test email       Hope that helps

User · Answer

Validate email while typing  with button state handling        email   on  input   function        var email       email   val        var filter        w-           0-9  1 3    0-9  1 3    0-9  1 3         w-          a-zA-Z  2 4   0-9  1 3               if   filter test email               invalid-email empty   append  Invalid Email Address              submit   attr  disabled   true         else             submit   attr  disabled   false             invalid-email   empty

User · Answer

A very simple solution is to use html5 validation    lt form gt     lt input type  email  required pattern                a-zA-Z  2 6   gt      lt input type  submit  gt   lt  form gt    http   jsfiddle net du676 56

User · Answer

You can use jQuery Validation and  in a single HTML line  you can validate the email and the email validation message  type  email  required data-msg-email  Enter a valid email account    You can use the data-msg-email parameter to place a personalized message or otherwise do not place this parameter and the default message will be displayed   Please enter a valid email address    Full example    lt form class  cmxform  id  commentForm  method  get  action    gt     lt fieldset gt       lt p gt         lt label for  cemail  gt E-Mail  required  lt  label gt         lt input id  cemail  type  email  name  email  required data-msg-email  Enter a valid email account   gt       lt  p gt       lt p gt         lt input class  submit  type  submit  value  Submit  gt       lt  p gt     lt  fieldset gt   lt  form gt   lt script src  https   ajax googleapis com ajax libs jquery 3 2 1 jquery min js  gt  lt  script gt   lt script type  text javascript  src  https   cdn jsdelivr net npm jquery-validation 1 17 0 dist jquery validate js  gt  lt  script gt   lt script gt      commentForm   validate     lt  script gt

User · Answer

Bug is in Jquery Validation Validation Plugin Only validates with   to change this   change the code to this   email  function  value  element            From http   www whatwg org specs web-apps current-work multipage states-of-the-type-attribute html e-mail-state- 28type email 29        Retrieved 2014-01-14        If you have a problem with this implementation  report a bug against the above spec        Or use custom methods to implement your own email validation     return this optional  element          a-zA-Z0-9    -        a-zA-Z0-9 -         a-zA-Z0-9  2 4      test  value

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lt script type    text javascript  src  http   ajax googleapis com ajax libs jquery 1 8 3 jquery min js  gt  lt  script gt   lt script type    text javascript  gt      function ValidateEmail email            var expr        w-           0-9  1 3    0-9  1 3    0-9  1 3         w-          a-zA-Z  2 4   0-9  1 3                   return expr test email                  btnValidate   live  click   function              if   ValidateEmail     txtEmail   val                   alert  Invalid email address                       else               alert  Valid email address                        lt  script gt   lt input type    text  id    txtEmail    gt   lt input type    button  id    btnValidate  value    Validate    gt

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As others have mentioned you can use a regex to check if the email address matches a pattern  But you can still have emails that match the pattern but my still bounce or be fake spam emails  checking with a regex var regex       a-zA-Z0-9   -        a-zA-Z0-9-         a-zA-Z0-9  2 4       return regex test email    checking with a real email validation API You can use an API which will check if the email address is real and currently active  var emailAddress    quot foo bar com quot  response     get  quot https   isitarealemail com api email validate email  quot        emailAddress      function responseHandler data            if  data status      valid                    the email is valid and the mail box is active           else                  the email is incorrect or unable to be tested                    For more see https   isitarealemail com or blog post

User · Answer

you should see this jquery validate js add it to your project  using it like this    lt input id  email  name  email  class  required email   gt

User · Answer

validator addMethod  mymail   function value  element            return this optional  element          a-zA-Z0-9    -        a-zA-Z0-9 -         a-zA-Z0-9  2 4      test  value        Enter valid email       This may help  a small modification to the answer by user4974898

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Javascript Email Validation in MVC ASP NET  The problem I came across while using Fabian s answer  is implementing it in an MVC view because of the Razor   symbol  You have to include an additional   symbol to escape it  like so      To Avoid Razor In MVC  function isEmail email      var regex       a-zA-Z0-9   -         a-zA-Z0-9-         a-zA-Z0-9  2 4         return regex test email       I didn t see it elsewhere on this page  so I thought it might be helpful   EDIT  Here s a link from Microsoft describing it s usage   I just tested the code above and got the following js   function validateEmail email      var regex       a-zA-Z0-9   -        a-zA-Z0-9-         a-zA-Z0-9  2 4          return regex test email       Which is doing exactly what it s supposed to do

User · Answer

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

User · Answer

if    input email-address   getVerimailStatus    lt  0       incorrect code      if    input email-address   getVerimailStatus       error        right code

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This question is more dificult to answer than seems at first sight  If you want to deal with emails correctly   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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