How does glob negation work?

Question

I'm using gulp and don't understand the method of the following glob pattern:

'./bower_components/**/!(*.min).css'

It selects all the css files except the min postfixed ones. What would have it compiled to if it had been regex expression?

I understood why './bower_components/**/*!(.min).css' form does not work, but I still don't understand why there is no need to put a asterisk before .css like:

'./bower_components/**/!(*.min)*.css'

The asterisk before the .min reads the chars or could you explain me? How did this pattern find the match before the negation bracket if the star is in the bracket? I image it as a regex. Thank you.

Will there ever be a case when there are characters between ".min" and ".css"? — Ignacio Vazquez-Abrams, Apr 21 '17 at 21:56
no, but the question would be about the understanding this pattern, not the result. How did this pattern find the match before the negation bracket if the star is in the bracket? I image it as a regex. — Lajos, Apr 21 '17 at 22:06
"I image it as a regex." Well, that's the problem. It's not a regex, it's a glob. First you glob it, then you see if anything matches that shouldn't. — Ignacio Vazquez-Abrams, Apr 21 '17 at 22:08
the result of it is correct but how does this syntax work? './bower_components/**/!(*.min).css' runs twice? — Lajos, Apr 21 '17 at 22:31
It globs './bower_components/**/*.css' and removes anything that shouldn't match. — Ignacio Vazquez-Abrams, Apr 21 '17 at 22:32
Does it take the asterisk inside from the brackets of !(*.min)? — Lajos, Apr 21 '17 at 22:34

score 6 · Answer 1 · answered May 21 '20 at 20:06

6

I found this stackoverflow answer related to this question: https://stackoverflow.com/a/36295481/2929207

Applied to this question it would be as follows:

import glob
files = glob.glob('./bower_components/**/[!*.min].css')

answered May 21 '20 at 20:06

Pablo Reyes

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How does glob negation work?

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