python_re_examples.py

# Simple re examples in python

import re

files = ("re_pro_p00012.txt", "re_neg_p00014.txt", "lrr_p00014.txt")

category_pattern = r"(?P<category>[a-zA-Z]+)_.*"

for file in files:
    match = re.match(category_pattern, file)
    print match.group("category")