Regular expression to match start of filename and filename extension

Question

What is the regular expression to match strings (in this case, file names) that start with \'Run\' and have a filename extension of \'.py\'?

The regular expression s

Answer 1

I don't really understand why you're after a regular expression to solve this 'problem'. You're just after a way to find all .py files that start with 'Run'. So this is a simple solution that will work, without resorting to compiling an running a regular expression:

import os
for filename in os.listdir(dirname):
    root, ext = os.path.splitext(filename)
    if root.startswith('Run') and ext == '.py':
        print filename