X-Received: by 10.224.41.74 with SMTP id n10mr11523807qae.1.1404671174433; Sun, 06 Jul 2014 11:26:14 -0700 (PDT)
X-Received: by 10.140.47.102 with SMTP id l93mr440427qga.5.1404671174398; Sun, 06 Jul 2014 11:26:14 -0700 (PDT)
Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!us.feeder.erje.net!usenet.blueworldhosting.com!feeder01.blueworldhosting.com!peer02.iad.highwinds-media.com!news.highwinds-media.com!feed-me.highwinds-media.com!i13no6465507qae.1!news-out.google.com!a8ni6411qaq.1!nntp.google.com!i13no6465502qae.1!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail
Newsgroups: comp.lang.python
Date: Sun, 6 Jul 2014 11:26:14 -0700 (PDT)
Complaints-To: groups-abuse@google.com
Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=64.229.140.25; posting-account=SZ_svQkAAACWRFG2bDA-zgq8ILyl4-vo
NNTP-Posting-Host: 64.229.140.25
User-Agent: G2/1.0
MIME-Version: 1.0
Message-ID: <809dbbdf-b452-4f25-a1ff-f00a2202939d@googlegroups.com>
Subject: What is the difference between matchObj.group() and matchObj.group(0)
From: rxjwg98@gmail.com
Injection-Date: Sun, 06 Jul 2014 18:26:14 +0000
Content-Type: text/plain; charset=ISO-8859-1
X-Received-Bytes: 1932
X-Received-Body-CRC: 238727635
Xref: csiph.com comp.lang.python:74041

Hi,

I cannot get the difference between matchObj.group() and matchObj.group(0),
Although there definitions are obvious different. And group() mentions 'tuple'.
tuple means all the elements in line object?



Match Object Methods

Description

group(num=0) This method returns entire match (or specific subgroup num) 
groups()     This method returns all matching subgroups in a tuple 
             (empty if there weren't any) 



I run the following code. Even I add more words to line object, Both have the
same output.

Could you clarify this question?


Thanks again.





#!/usr/bin/python
import re

line = "Cats are smarter than dogs"

matchObj = re.match( r'(.*) are (.*?) .*', line, re.M|re.I)

if matchObj:
   print "matchObj.group() : ", matchObj.group()
   print "matchObj.group(1) : ", matchObj.group(1)
   print "matchObj.group(2) : ", matchObj.group(2)
else:
   print "No match!!"