Home/ Questions/Q 926559
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-15T19:42:12+00:00

We have a textbox which accepts comma separated email address. The regular expression is

  • 0

We have a textbox which accepts comma separated email address. The regular expression is

^(\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*\s*[,]?\b)*$.

However now I am unable to add a length validation to this expression. Each email address should not be more than 150 characters. I have tried 

^((\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)){1,150}\s*[,]?\b)*$.

But it doesn’t work.
Can you please modify the regex so that it also implements this validation too.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    I would rather not complicate this regex further and add explicit length check before checking that e-mail matches. In JavaScript it will be something like the following:

    function validateEmail(email) {
    var regex = /^(\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*\s*[,]?\b)*$/;
    // 20 is used instead of 150 for sake of example
    return email.length <= 20 && regex.test(email);
}
// validateEmail("jdoe@example.com") == true
// validateEmail("loooooooooooooooooooonjohn@example.com") == false

    By the way, dot after $ in your regex seems to be a mistake, so I skipped it in my snippet.

    • 0