Exclude particular number regex

Question

I have written a regex to exclude particular numbers 00, 000, and 255

I'm using regex - ^((?!255|00|000)[1-9]*)$

The problem I'm facing is when i enter 80 or any other number ending with 0 it excludes that number also which i don't want

Using regexes for number ranges is much like using sledgehammer to nail tiny nails. It may work, but you will get hurt. It's better to use right tool for the job - extract numbers and filter them out in your script or program. — mvp, Feb 21 '19 at 05:38

Tim Biegeleisen · Accepted Answer · 2019-02-21T05:34:04.593

3

Try this version:

^(?!(?:255|00|000)$)[0-9]*$

Demo

The major change I made was to allow any digits after the negative lookahead assertion. This should be OK, because at that point you have already asserted that your blacklist numbers 00, 000, and 255 do not appear.

edited Feb 21 '19 at 05:34

answered Feb 21 '19 at 05:31

Tim Biegeleisen

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This excludes `0000`, however. – blhsing Feb 21 '19 at 05:33
1

@blhsing Probability of missing edge cases on SO regex questions: Very high :-) – Tim Biegeleisen Feb 21 '19 at 05:34

Exclude particular number regex

1 Answers1

Demo