Regular_expressions_quick_guide.py

# Python Regular Expression Quick Guide
#
# ^        Matches the beginning of a line
# $        Matches the end of the line
# .        Matches any character
# \s       Matches whitespace
# \S       Matches any non-whitespace character
# *        Repeats a character zero or more times
# *?       Repeats a character zero or more times
#          (non-greedy)
# +        Repeats a character one or more times
# +?       Repeats a character one or more times
#          (non-greedy)
# [aeiou]  Matches a single character in the listed set
# [^XYZ]   Matches a single character not in the listed set
# [a-z0-9] The set of characters can include a range
# (        Indicates where string extraction is to start
# )        Indicates where string extraction is to end