To display "Enter valid Email Address" if user used three dots after @ symbol

Question

I want to display error message if user enter three dots likesteve@gmail.com.co.nz so after .co if user use .nz Error should be thrown because user has already entered two dots. Below is my Email validation which i am using right now

var EmailValid = "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9.-]+[A-Za-z0-9'\.\-\s\,\#\]*(\\.[A-Za-z]{2,3})$";

Any idea how to do that?

http://stackoverflow.com/questions/46155/validate-email-address-in-javascript get regexp from here — Andrew Evt, Apr 29 '16 at 11:29
Why do you want to reject perfectly valid email addresses? (If you want a real world example, I used to have an address which went `someone@some-campus.some-school.some-county.sch.uk`) — Quentin, Apr 29 '16 at 12:05
even i raised the same question to client but you know you have to obey until they are paying you. — Steve, Apr 29 '16 at 12:12

score 0 · Accepted Answer · answered Apr 29 '16 at 12:02

This is what I came up with, based on your Regex and the condition that there can be no more than three . after the @ sign:

^[\w-+]+(?:\.[\w-]+)*@[\w-]+\.[\w'\-\s,#\\]*\.?(?:[A-Za-z]{2,3})$

Notes:

I swapped out your _A-Za-z0-9 for \w as it is the same thing.
I moved the . matching out of the quantifiers (i.e., + and *) as you have a requirement to match between 1-2 max .s after the @ sign.
I kept most of your required matches for emails, even though I've never seen such symbols used in email endings before. So there may be room for improvement there.

Railroad Diagram:

Regex101

@Steve can you provide me an example of cases that do not work? I have linked the Regex101 link with example cases that work and do not work following your use case. — timolawl, May 06 '16 at 16:26

To display "Enter valid Email Address" if user used three dots after @ symbol

1 Answers1