IP regex not working (with non capturing groups imbricated and negative lookahead)

[David-Lannion]

Trying IP regex :
^(?:(?:1\d{2}|[1-9]?\d|2[0-4]\d|25[0-5])(?:\.(?!$)|$)){4}$
Is generating :
255.226124138.
9253252.112
96.119.163.252.
251.106.136.16
Only the last one is good

[bjmc]

Thanks for the report @David-Lannion! I'm happy to review a PR for this issue, otherwise I'll look into it when I have some free time.

In the meantime, as a workaround, there's some simpler regexes suggested here that avoid the negative lookahead. You might have more luck with one of them.