CODEWITHSUNDEEP
regex
Kavinda Keshan Rasnayake
Kavinda Keshan Rasnayake

Reputation: 763

Regex to reject specific email

I am trying to write a regex to match emails such that it rejects two email addresses [email protected] and [email protected] and match all other email addresses from a specific domain. So far, I have made the following pattern:

^([email protected]|[email protected])|(A-Z0-9)[A-Z0-9._%+-][email protected]$

So far, it is able to reject the main email addresses I want to block, but it accepts all other strings through this. As an alternative, I wrote the following regex:

^(?!test|tes2)[A-Z0-9._%+-][email protected]$

However, this rejects all patterns that start with either test or tes2 exclusively.

What is a better regular expression to get this scenario achieved?

Upvotes: 2

Views: 353

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 627292

"Fixing" your regex, you need to make sure you also test for @ inside the lookahead patterns to match test and tes2 as full user names:

^(?!test@|tes2@)[A-Za-z0-9._%+-]+@testdomain\.com$
        ^     ^

Remember to escape a dot, too. See the regex demo.

However, you might want to be less restrictive on the user name part, and just use \S+ instead of your character class:

^(?!test@|tes2@)\S+@testdomain\.com$
                ^^^

See another regex demo. The \S+ pattern matches any 1 or more chars other than whitespace characters.

Upvotes: 1

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