REGEX for Numbers from -999 to 999 , but not -0

Question

^-?[0-9][0-9]{0,2}$

I have this regex but numbers but it allows -0, Any solution?

Doesn't appear to be right dupe. As `REGEX for Numbers from -999 to 999 , but not -0` is not same as `matching everything but specific pattern` — anubhava, Feb 20 '21 at 06:36
Think of it as *match all `n` and `-n` except `-0`*, which is a subset of *match everything but a specific pattern*. Not saying deletion was warranted though. — oguz ismail, Feb 20 '21 at 06:55
Hmm but `n and -n except -0` is different from `match everything but a specific pattern`. For later case obvious solution would be: `^(?!.*specific).*$` but that won't work with this problem — anubhava, Feb 20 '21 at 09:01
For my requirement i just wanted regex that allows 0 , but does not allow -0 and that is working with ^(?!-0$)-?[0-9][0-9]{0,2}$ — Baljinder Singh, Mar 10 '21 at 09:11
`but not -0` part is covered in dupe question but this question is also about matching numbers `-999` to `999`. — anubhava, Mar 10 '21 at 10:33

score 5 · Accepted Answer · answered Jan 25 '21 at 06:59

5

You may use a negative lookahead assertion to disallow certain match:

^(?!-0$)-?[0-9][0-9]{0,2}$

Take note of (?!-0$) that says fail the match if we have -0 and end anchor after matching start anchor ^.

answered Jan 25 '21 at 06:59

anubhava

1 Answers1