How to find out which named regular expression group corresponds to which positional regex group

[Mattias Ugelvik]

I'm making a string manipulation tool in which I need to know this correlation.

Take this example: re.match('(?P<first>a?)(?P<second>b?)', '')

I need to know that 'first' is group #1, and 'second' is group #2. I
need this to resolve certain ambiguities. I was hopin