Python regular expression match and search usage instance _python

This example describes the Python regular expression match and search usage. Share to everyone for your reference. The specific analysis is as follows:

Python provides the main regular expression operations in 2: Re.match and Re.search.

Match: Matches only from the beginning of the string with the regular expression, the match returns Matchobject successfully, otherwise none is returned;

Search: All string attempts to match the regular expression, if all the strings are not matched successfully, return none, otherwise return matchobject; (re.search equivalent to the default behavior in Perl)

Import re
def testsearchandmatch ():
 s1= "HelloWorld, I am!"
 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 again for you to provide 2 of this site's regular expression online tools for everyone to reference use (Baozheng generation, matching and verification, etc.):

JavaScript Regular expression on-line test tool:http://tools.jb51.net/regex/javascript

Regular Expression online generation tool:Http://tools.jb51.net/regex/create_reg

I hope this article will help you with your Python programming.