Python: How to use RegEx in an if statement?

import re
if re.match(regex, content):
  blah..

You could also use re.search depending on how you want it to match.

You can run this example:

"""
very nice interface to try regexes: https://regex101.com/
"""
# %%
"""Simple if statement with a regex"""
import re

regex = r"\s*Proof.\s*"
contents = ['Proof.\n', '\nProof.\n']
for content in contents:
    assert re.match(regex, content), f'Failed on {content=} with {regex=}'
    if re.match(regex, content):
        print(content)