电子邮件正则表达式验证JavaScript不应包含example.com

Question

I have requirement for email validation that the email should not be with a particular domain,

for example if the email is email@example.com it is invalid. That is the RegExp should exclude the domain example.com

I tried to use like to exclude a string like

^\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,3}$.?!example.com

It's not working

Please help me with a RegExp .

Answer 1

Use this regex

(?=.*@)(?!.*example).*

This matches, all emails, that does not come from domain example.com

I've made a function for you.

function isValidEmail(input, excludedDomain) {
    alert(new RegExp("(?=.*@)(?!.*" + excludedDomain + ").*").test(input));
}
isValidEmail("hi@example.com", "example"); //false
isValidEmail("hi@hotmail.com", "example"); //true

Demo: http://jsfiddle.net/W3rLU/

Answer 2

The correct Regexp is something like this.

^\w+@(?!example\.com)[a-zA-Z_]+?\.[a-zA-Z]{2,3}$

Debuggex Demo

It means: after the @, check that is not followed by "example.com" and then check that is followed by a character and a two or three letter domain.

I also recommend you to change it a bit to allow domain names with numbers and dashes (eg myname@domain-123.com ) and subdomains ( myname@subdomain.domain.com ) with this expression:

^\w+@(?!example\.com)[A-Za-z0-9-]+(\.[A-Za-z0-9-]+)*(\.[A-Za-z]{2,6})$

Debuggex Demo