How do you use a regex in a list comprehension in Python?

Question

I\'m trying to locate all index positions of a string in a list of words and I want the values returned as a list. I would like to find the string if it is on its own, or if

Answer 1

You don't need to assign the result of match back to x. And your match should be on x rather than list.

Also, you need to use re.search instead of re.match, since your the regex pattern '\W*myString\W*' will not match the first element. That's because test; is not matched by \W*. Actually, you only need to test for immediate following and preceding character, and not the complete string.

So, you can rather use word boundaries around the string:

pattern = r'\b' + re.escape(myString) + r'\b'
indices = [i for i, x in enumerate(myList) if re.search(pattern, x)]