re_groups.py

#!/usr/bin/env python


from re_test_patterns import test_patterns

test_patterns(
    'abbaaabbbbaaaaa',
    [('a(ab)',      'a followed by literal ab'),
     ('a(a*b*)',    'a followed by 0-n a and 0-n b'),
     ('a(ab)*',     'a followed by 0-n ab'),
     ('a(ab)+',     'a followed by 1-n ab'),
     ])