Regex to exclude certain strings from path

Question

I need a regex that will accept all paths except those that have /cantbe or /cantbe/this

So

this/is/ok/filename.tr

is a match but

this/is/ok/cantbe/filename.tr

or

this/is/ok/cantbe/this/filename.tr

are not matches.

I tried

.*(?!\/cant\/)(?!\/cant\/this).*\.tr

but the paths above are still matches

Would `is/this/ok/cantbesomething` be a match? And since I assume `/it/cantbe/that` shouldn't be a match, since it contains `/cantbe`, why do you have the extra rule that `/cantbe/this` cannot be in it, since that already contains `/cantbe`? — Grismar, Oct 08 '20 at 00:33
@Grismar `is/this/ok/cantbesomething` would not be a match. You are right that I can drop `/cantbe/this` since it is included in `/cantbe/`. Basically any path with `/cantbe/` is not a match. — user2175783, Oct 08 '20 at 00:36
The `.*` should be inside the lookahead, and use an anchor `^` to assert the start of the string `^(?!.*\/cantbe).+` See https://regex101.com/r/9nGZfx/1 — The fourth bird, Oct 08 '20 at 12:33

score 1 · Answer 1 · answered Oct 08 '20 at 00:37

1

try this

^((?!\/cantbe\b).)*$

Try it out here

answered Oct 08 '20 at 00:37

vedda

1 Answers1