Here is an example of a failed match where None is returned: : match « Regular Expressions « Python Tutorial

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Python Tutorial » Regular Expressions » match 




import re

m = re.match('foo', 'bar')# pattern does not match string
if m is not None: m.group()(1-line version of ifclause)

m = re.match('foo', 'food on the table') # match succeeds
print m.group()

print re.match('foo', 'food on the table').group()














16.4.match
16.4.1.Matching Strings with match()
16.4.2.Here is an example of a failed match where None is returned:
16.4.3.Repetition, Special Characters, and Grouping
16.4.4.Compiled regular-expression and match objects.
16.4.5.Repetition patterns, matching vs searching.
16.4.6.classes and special sequences.
16.4.7.Dig out path
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