Regex Apostrophe how to match?

Question

I want to add to this rule match on Apostrophe \'

rule = re.compile(r\'^[^*$<,>?!]*$\')

I have tried:

Answer 1

You have to escape the apostrophe, otherwise it will be counted as the end of the raw string:

rule = re.compile(r'^[^*$<,>?!\']*$')

Or, you can use " to surround your string, which is perfectly valid in python:

rule = re.compile(r"^[^*$<,>?!']*$")