Regular expression for email not working

Question

I am putting validation on email field but it shows error of invalid even where the email is typed in correct format.

Code

<script type="text/javascript"> function formvalidate(){ var email=document.signup_form.email.value; var check_email= RegExp("^[A-Z0-9._-]+@[A-Z0-9.-]+\.[A-Z0-9.-]+$"); if(email=="") { alert("cannot be empty!"); document.signup_form.email.focus(); return false; } else if(!check_email.test(email)) { alert("enter valid email address!"); document.signup_form.email.focus(); return false; } else { return true; } } </script>

Thanks

Your regex only accepts capital letters.

Maria Ivanova
– Maria Ivanova

2016-06-29 06:35:08 +00:00
Commented Jun 29, 2016 at 6:35 — Maria Ivanova
– Maria Ivanova, Commented Jun 29, 2016 at 6:35
By your regex [email protected]/.@... are valid emails

Justinas
– Justinas

2016-06-29 06:36:43 +00:00
Commented Jun 29, 2016 at 6:36 — Justinas
– Justinas, Commented Jun 29, 2016 at 6:36
Possible duplicate of Validate email address in JavaScript?

Mehdi Dehghani
– Mehdi Dehghani

2016-11-14 11:35:38 +00:00
Commented Nov 14, 2016 at 11:35 — Mehdi Dehghani
– Mehdi Dehghani, Commented Nov 14, 2016 at 11:35

NikuNj Rathod · Accepted Answer · 2016-06-29 06:46:50Z

try this function

function validateEmail(elementValue) { var emailPattern = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/; return emailPattern.test(elementValue); }

Please refer this fiddle : http://jsfiddle.net/gabrieleromanato/Ra85j/

Mehdi Dehghani · Accepted Answer · 2021-03-16 06:52:32Z

1

1- Use this regular expressions instead

\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*

2- Change this if (!check_email.test(email)) to

if (check_email.test(email))

edited Mar 16, 2021 at 6:52

Mehdi Dehghani

11.7k6 gold badges64 silver badges68 bronze badges

answered Jun 29, 2016 at 6:39

Ali Niazi

193 bronze badges

1 Comment

Natha Odedara Over a year ago

I used this expression but still shows invalid error on valid email ([email protected])

Nikhil Ghuse · Accepted Answer · 2016-06-29 06:41:19Z

Try this fuction

 function isEmail(inputString) { var regExpEmail = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/; try { return regExpEmail.test(inputString.value); } catch (e) { return false; }

}

KO. · Accepted Answer · 2016-06-29 06:41:41Z

Change var check_email= RegExp("^[A-Z0-9._-]+@[A-Z0-9.-]+\.[A-Z0-9.-]+$"); to a function like this:

function validateEmail(email) { var re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\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); }

Community · Accepted Answer · 2017-05-23 10:29:37Z

You regex is not correct, there are many things that you've not considered, like your regex accepts only capital letters, to include both capital and small letters you should use :

[a-zA-Z0-9]

not this :

[A-Z0-9]

You can use this regex for validating email :

/^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\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,}))$/

read this for details

Justinas · Accepted Answer · 2016-06-29 06:44:44Z

Source and some tests

You can use this regex for email:

RegExp('\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b', 'i')

Mahendra Kulkarni · Accepted Answer · 2016-06-29 06:52:24Z

try this example : email validation using JQuery

function validateEmail(email) { var re = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\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() { $("#emailvalidate").text(""); var email = $("#email").val(); if (validateEmail(email)) { $("#emailvalidate").text(email + " is valid"); $("#emailvalidate").css("color", "green"); } else { $("#emailvalidate").text(email + " is not valid"); $("#emailvalidate").css("color", "red"); } return false; } $("form").bind("submit", validate);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <form> <p>Enter an email address:</p> <input id='email'> <button type='submit' id='btn'>Validate</button> </form> <h2 id='emailvalidate'></h2>

Vikash Kumar · Accepted Answer · 2016-06-29 07:21:56Z

Try this code -

function formvalidate() { var email = document.signup_form.email.value; var check_email = RegExp("^([a-z0-9\\+_\\-]+)(\\.[a-z0-9\\+_\\-]+)*@([a-z0-9\\-]+\\.)+[a-z]{2,6}$", 'ig'); if(email == "") { alert("cannot be empty!"); document.signup_form.email.focus(); return false; } else if(!check_email.test(email)) { alert("enter valid email address!"); document.signup_form.email.focus(); return false; } else { return true; } }

<form name="signup_form"> <input type="text" name="email" value="" /> <input type="button" name="validate" value="Validate" onclick="formvalidate()"/> </form>

Nono · Accepted Answer · 2022-11-08 20:10:14Z

I am using below regex to validate email pattern. Regex is not 100% solution to validate an email, better use email verification. Regex can help to validate format or pattern only.

Jsfiddle: DEMO

Jsfiddle: Regex check and sample email DEMO

function validateEmail(elementValue) { document.getElementById('error').innerHTML = elementValue + ', email is incorrect'; var emailPattern = /^[a-z0-9](?:[a-z0-9]+\.)*(?!.*(?:__|\\.\\.))[a-z0-9_]+@(?:(?:(?:[a-zA-Z0-9](?:[a-zA-Z0-9](?!\.)){0,61}[a-zA-Z0-9]?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9](?!$)){0,61}[a-zA-Z0-9]?)|(?:(?:(?:[01]?\d{1,2}|2[0-4]\d|25[0-5])\.){3}(?:[01]?\d{1,2}|2[0-4]\d|25[0-5])))$/; if (emailPattern.test(elementValue)) { document.getElementById('error').innerHTML = elementValue + ', email is correct'; } return false; }

#error { color: red; font-size: 2rem; } input[type='email'] { padding: 5px; width: 300px; border-color: blue; font-size: 16px; }

<form name="signup_form"> <input type="email" value="" onblur="validateEmail(this.value)"> <br /> <lable id="error"></lable> </form>

Mr.7 · Accepted Answer · 2016-06-29 07:30:42Z

Change your regular expression to below

^[a-zA-Z0-9._-]+@[A-Za-z0-9.-]+\.[a-zA-Z0-9.-]+$

Hope this helps :)

Collectives™ on Stack Overflow

Regular expression for email not working

10 Answers 10

Comments

1 Comment

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

10 Answers 10

Comments

1 Comment

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Linked

Related