python--Regular Expressions

First, Python's regular

1.python Regular expressions using the re-module

Import Re # matching using the match method result = Re.match (regular expression, string to match)#  If the previous step matches the data, you can use the group method to extract the data Result.group ()

Second, the regular rule

1. String

character	function
.	Matches any of 1 characters (except \ n)
[ ]	Match the characters enumerated in []
\d	Match number, which is 0-9
\d	Matches a non-numeric, that is, not a number
\s	Match whitespace, that is, the Space, TAB key
\s	Match non-whitespace
\w	Match word characters, i.e. A-Z, A-Z, 0-9, _
\w	Match non-word characters

2. Indicate quantity

character	function
*	Matches the previous character 0 or more times, which is optional
+	Match the previous character 1 or more times, i.e. at least 1 times
?	Matches the previous character 1 or 0 times, either 1 times or no
{m}	Match the previous character appears m times
{m,}	Matches the previous character at least m times
{M,n}	Match the previous character appears from M to N times

python--Regular Expressions