Python——Basic Regular Expression Meta-Characters, Including Wildcards, Ranges and Closures

Operator	Behavior
.	Wildcard, matches any character
^abc	Matches some pattern abc at the start of a string
abc$	Matches some pattern abc at the end of a string
[abc]	Matches one of a set of characters
[A-Z0-9]	Matches one of a range of characters
ed|ing|s	Matches one of the specified strings (disjunction)
*	Zero or more of previous item, e.g. a*, [a-z]* (also known as Kleene Closure)
+	One or more of previous item, e.g. a+, [a-z]+
?	Zero or one of the previous item (i.e. optional), e.g. a?, [a-z]?
{n}	Exactly n repeats where n is a non-negative integer
{n,}	At least n repeats
{,n}	No more than n repeats
{m,n}	At least m and no more than n repeats
a(b|c)+	Parentheses that indicate the scope of the operators