Exclude auto-generated files by Django within pre-commit-config.yaml using REGEX

Question

Since the auto-generated Django files don't fulfill numerous pylint-requirements, my pre-commit checker fails:

The files look usually like so:

They seem to be located automatically in a sub-folder called "migrations":

Now, I tried to leverage the pre-commit exclude expressions with a proper REGEX. This one seemed to work on an online REGEX-tester: [\w-]+\d+[^\\]*.py

Here is the proof:

Now, putting this into my pylint pre-commit checker does unfortunately nothing:

I also tried to just exclude the "migrations" folder, but I could not find a working expression either. How can I make this work?

Answer 1

your regex you tested and the regex you used are different:

# one you tested
[\w-]+\d+[^\\]*.py
# the one you tried
^[\w-]+\d+[^\\]*.py

the ^ anchors to the beginning of the string which is not what you want (your files are specifically in a subdirectory and not at the root of the repository)

additionally, slashes will always be forward slashes for pre-commit's file matching so you should instead exclude (and test against) forward slashes:

[\w-]+\d+[^/]*.py

a minor bug is you'd then match whatever1_py due to an un-escaped . (probably not a problem but here's an improvement):

[\w-]+\d+[^/]*\.py

you're also using a javascript regex tester -- while it doesn't matter for the features you're using here you probably want to use a python one as the patterns here are python regular expressions

so try this:

exclude: '[\w-]+\d+[^/]*\.py'

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disclaimer: I wrote pre-commit, though it matters less here since this is just a regex confusion