Negative Lookahead work around for RE2 Syntax

Asked Jan 16 '19 at 20:42

Active Jan 17 '19 at 07:12

Viewed 1,035 times

I was hoping to figure out how make re2 syntax work with a regular expression like the following:

(?!(support|help|admin|contact))@example\.com

Where you do not match on exactly those terms above.

For example, it should match:

[email protected]
[email protected]

but not match:

[email protected]
[email protected]

i I cannot figure out a way for exactly those terms. I have seen a lot of work arounds where it requires you to test if it does match in golang/the re2 processer, and then return false. However this is not possible, because a service requires the regex, and I cannot ask it to alternate the match value.

Any ideas?

edited Jan 17 '19 at 07:12

Jonathan Hall

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asked Jan 16 '19 at 20:42

John Zrobin

I would consider an API using only a regex where one might want to exclude matches to be broken. Unfortunately there's not much you can do here. – JimB Jan 17 '19 at 16:10
@JimB comment if there is any clue on this which would be helpful. Thanks! – CdVr Jul 22 '20 at 15:54
RE2 does not support lookarounds and will never support them. – Wiktor Stribiżew Jan 14 '21 at 15:37

Negative Lookahead work around for RE2 Syntax

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