JavaScript Regular Expression Email Validation

Question

This code is always alerting out  null   which means that the string does not match the expression   var pattern      w   a-zA-Z       a-zA-Z  2 3       function isEmailAddress str         str    azamsharp gmail com              alert str match pattern         return str match pattern

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I ve been using this function for a while  it returns a boolean value      Validates email address of course  function validEmail e        var filter      s   w -          w -           w -         w -          w -        s         return String e  search  filter     -1

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Sometimes most of the registration and login page need to validate email  In this example you will learn simple email validation  First take a text input in html and a button input like this   lt input type  text  id  txtEmail   gt   lt input type  submit  name  submit  onclick  checkEmail      gt    lt script gt      function checkEmail             var email   document getElementById  txtEmail            var filter          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   filter test email value                 alert  Please provide a valid email address                email focus              return false                   lt  script gt    you can also check using this regular expression   lt input type  text  id  txtEmail   gt   lt input type  submit  name  submit  onclick  checkEmail      gt    lt script gt      function checkEmail              var email   document getElementById  txtEmail            var filter       a-zA-Z0-9    -        a-zA-Z0-9 -         a-zA-Z0-9  2 4                if   filter test email value                 alert  Please provide a valid email address                email focus              return false                   lt  script gt    Check this demo output which you can check here   x000D   x000D  function checkEmail     x000D          var email   document getElementById  txtEmail    x000D          var filter          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          if   filter test email value     x000D              alert  Please provide a valid email address    x000D              email focus  x000D              return false  x000D            x000D        x000D   lt input type  text  id  txtEmail   gt  x000D   lt input type  submit  name  submit  onclick  checkEmail      gt  x000D   x000D   x000D    if email invalid then give alert message   if valid email then no alert message   for more info about regular expression  https   www w3schools com jsref jsref obj regexp asp  hope it will help you

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Simple but powerful email validation for check email syntax    var EmailId   document getElementById  Email   value  var emailfilter       w  -        w  -     w -     a-zA-Z  2 6     if  EmailId         amp  amp     emailfilter test EmailId              msg    Enter the valid email address  lt br   gt

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function isEmailAddress str       var pattern     w     -   w     w     -   w       w 2 3          return pattern test str       returns a boolean

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var emailRegex      A-Z0-9                amp  -        A-Z0-9                amp  -      A-Z0-9-      A-Z0-9-      i  if emailRegex test  yoursamplemail    alert  valid    else alert  invalid

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this is the one i am using on my page   http   www zparacha com validate-email-address-using-javascript-regular-expression      a-zA-Z0-9  -    a-zA-Z0-9 -     a-zA-Z  2 6

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with more simple regex  Here it is    var regexEmail     w   -     w     w   -   w      w   -   w      var email   document getElementById  txtEmail     if  regexEmail test email value         alert  It s Okay     else       alert  Not Okay        good luck

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You can add a function to String Object    Add this wherever you like in your javascript code String prototype isEmail   function         return   this match    w   a-zA-Z       a-zA-Z  2 3         var user email    test email example com    if user email isEmail            Email is valid     else         Email is invalid

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You may be interested in having a look at this page it list regular expressions for validating email address that cover more general cases

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You may be interested in this question  or this one   which highlights the fact that identifying valid email addresses via regexps is a very hard problem to solve  if at all solvable

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Email validation is easy to get wrong  I would therefore recommend that you use Verimail js    Why    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 jQuery plugin support   Another great thing with Verimail js is that it has spelling suggestion for the most common email domains and registered TLDs  This can lower your bounce rate drastically for users that misspell common domain names such as gmail com  hotmail com  aol com  aso    Example    test gnail com -  Did you mean test gmail com  test hottmail con -  Did you mean test hotmail com    How to use it   The easiest way is to download and include verimail jquery js on your page  After that  hookup Verimail by running the following function on the input-box that needs the validation      input email-address   verimail       messageElement   p status-message        The message element is an optional element that displays a message such as  Invalid email    or  Did you mean test gmail com    If you have a form and only want to proceed if the email is verified  you can use the function getVerimailStatus as shown below   if    input email-address   getVerimailStatus    lt  0          Invalid email  else         Valid email     The getVerimailStatus-function returns an integer code according to the object Comfirm AlphaMail Verimail Status  As shown above  if the status is a negative integer value  then the validation should be treated as a failure  But if the value is greater or equal to 0  then the validation should be treated as a success

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Little late to the party  but here goes nothing     function isEmailValid emailAdress        var EMAIL REGEXP   new RegExp    a-z0-9       a-z0-9      a-z0-9-      a-z0-9-        a-z  2 15       i        return EMAIL REGEXP test emailAdress      http   jsfiddle net yrshaikh xvd6H

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I have been using this one          w  -        w  -     w -     a-zA-Z  2 6      It allows that   before    xyz abc xyz com

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It would be best to use   var pattern      w   a-zA-Z       a-zA-Z  2 20      This allows domains such as  whatever info  4 letters at the end   Also to test  using  pattern test  exampleemail testing info    returns true if it works  http   www w3schools com js js obj regexp asp

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You should bear in mind that a-z  A-Z  0-9       and - are not the only valid characters in the start of an email address   Gmail  for example  lets you put a     sign in the address to  fake  a different email  e g  someone gmail com will also get email sent to someone else gmail com    micky o finnagan wherever com would not appreciate your code stopping them entering their address     apostrophes are perfectly valid in email addresses   The Closure  check  of a valid email address mentioned above is  as it states itself  quite na  ve   http   code google com p closure-library source browse trunk closure goog format emailaddress js 198  I recommend being very open in your client side code  and then much more heavyweight like sending an email with a link to really check that it s  valid   as in - syntactically valid for their provider  and also not misspelled    Something like this   var pattern           -a-z      a-z    2 6    Bearing in mind that theoretically you can have two   signs in an email address  and I haven t even included characters beyond latin1 in the domain names   http   www eurid eu en eu-domain-names idns-eu  http   haacked com archive 2007 08 21 i-knew-how-to-validate-an-email-address-until-i aspx

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You can also try this expression  I have tested it against many email addresses   var pattern      A-Za-z0-9    -     A-Za-z0-9-        A-Za-z0-9  2 4  museum

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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          BTW  please don t validate email addresses on the client-side  Your regular expression is way too simple to pass for a solid implementation anyway   See the real thing here  http   www ex-parrot com  pdw Mail-RFC822-Address html

[javascript] JavaScript Regular Expression Email Validation

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