regex.py

# Title: Regular Expressions with Python
# Authors: Clay McLeod
# Description: Shows you how to find all instances of a regular expression
#              in a string
# Section: Python
# Subsection: General
#
# Python docs on Regex: https://docs.python.org/2/howto/regex.html
#
# Notes:
#
# 1) raw strings have an 'r' prepending the string. They do not process special
#     characters
# 2) regex matching methods:
#    a) match() - looks at the beginning of the string only
#    b) search() - looks anywhere in the string for a match
#    c) findall() - returns all instances of the matches in list form

import re

raw_string = r'[A-Za-z]atch'
compiled_regex = re.compile(raw_string)

for token in compiled_regex.findall("Catch the match flying down the hatch"):
    print "Token %s" % token