http://stackoverflow.com/questions/1998104/is-it-safe-to-use-user-input-for-pythons-regular-expressions new regex library: https://pypi.python.org/pypi/regex
http:// stackoverflow. com/questions/ 1998104/ is-it-safe- to-use- user-input- for-pythons- regular- expressions /pypi.python. org/pypi/ regex
new regex library: https:/