Python: Regular expression re-module

‘.‘ Default match any character except \ n, if flag Dotall is specified, matches any character, including line break
The ' ^ ' matches the beginning of the character, and if you specify the flags MULTILINE, this can also be matched on (r "^a", "\nabc\neee", and flags = Re. MULTILINE)
' $ ' matches the end of the character, or E.search ("foo$", "BFOO\NSDFSF", flags = Re. MULTILINE). Group () can also
' * ' matches the character before the * number 0 or more times, Re.findall ("ab*", "Cabb3abcbbac") results for [' ABB ', ' ab ', ' a ']
' + ' matches the previous character 1 or more times, Re.findall ("ab+", "Ab+cd+abb+bba") results [' AB ', ' ABB ']
‘?‘ Match a previous character 1 or 0 times
' {m} ' matches the previous character m times
' {n,m} ' matches the previous character N to M times, Re.findall ("ab{1,3}", "ABB ABC abbcbbb") Results ' ABB ', ' AB ', ' ABB ']
| Match | left or | Right character, re.search ("abc| ABC "," ABCBABCCD "). Group () result ' ABC '
' (...) ' Group match, Re.search ("(ABC) {2}A (123|456) C", "abcabca456c"). Group () Results abcabca456c
' \a ' matches only from the beginning of the character, Re.search ("\aabc", "ALEXABC") are not matched
' \z ' matches the end of the character, same as $
' \d ' matches the number 0-9
' \d ' matches non-numeric
' \w ' match [a-za-z0-9]
' \w ' matches non-[a-za-z0-9]
' \s ' matches whitespace characters, \ t, \ n, \ r, Re.search ("\s+", "Ab\tc1\n3"). Group () result ' \ t '
‘(?   P<name&gt, ...) ' Group Matching Re.search (? P<province>[0-9]{4}) (? P<city>[0-9]{2}) (? P&LT;BIRTHDAY&GT;[0-9]{4}) "," 371481199306143242 "). Groupdict (" city ") result {' Province ': ' 3714 ', ' City ': ' Bayi ', ' birthday ' : ' 1993 '}

Re.match () match from the beginning
Re.search () match contains
Re.findall () places all matching characters into the list of elements returned
Re.split () takes a matched character as a list separator
Re.sub () match characters and replace

Python: Regular expression re-module