Python regular expressions match and search usage instances

This article illustrates the use of python regular expressions match and search. Share with you for your reference. Specific analysis is as follows:

Python provides two major regular expression operations: re.match and re.search.

Match: matches the regular expression only from the beginning of the string. A successful match returns matchobject, otherwise returns none.

Search: try to match all strings of the string with the regular expression. If all strings fail to match, return none; otherwise, return matchobject. (re. Search is equivalent to the default behavior in perl)

import re
def testsearchandmatch():
 s1="helloworld, i am 30 !"
 w1 = "world"
 m1 = re.search(w1, s1)
 if m1:
 print("find : %s" % m1.group())
 if re.match(w1, s1) == none:
 print("cannot match")
 w2 = "helloworld"
 m2 = re.match(w2, s1)
 if m2:
 print("match : %s" % m2.group())
testsearchandmatch()
#find : world
#cannot match
#match : helloworld

PS: about the regular, here to provide you with 2 sites of the regular expression online tools for your reference (package regular generation, matching and verification, etc.) :

JavaScript regular expression online testing tool: (link: http://tools.jb51.net/regex/javascript)

Regular expression online generation tool: (link: http://tools.jb51.net/regex/create_reg)

I hope this article has helped you with your Python programming.