the regex--- pat = r'([a-z].+?\s)(.+)(?:(\(.+\)))?' ,do not work at all.
>>> rfile.close() >>> import re >>> rfile=open("tv.txt","r") >>> pat1 = r'([a-z].+?\s)(.+)((\(.+\)))?' >>> for line in rfile.readlines(): ... Match=re.match(pat1,line) ... print "1group is ",Match.group(1),"2group is ",Match.group(2),"3group is ",Match.group(3) ... 1group is http://202.177.192.119/radio5 2group is 香港电台第五台(可于Totem/VLC/MPlayer播放) 3group is None 1group is http://202.177.192.119/radio35 2group is 香港电台第五台(DAB版,可于Totem/VLC/MPlayer播放) 3group is None 1group is http://202.177.192.119/radiopth 2group is 香港电台普通话台(可于Totem/VLC/MPlayer播放) 3group is None 1group is http://202.177.192.119/radio31 2group is 香港电台普通话台(DAB版,可于Totem/VLC/MPlayer播放) 3group is None 1group is octoshape:rthk.ch1 2group is 香港电台第一台(粤) 3group is None 1group is octoshape:rthk.ch2 2group is 香港电台第二台(粤) 3group is None 1group is octoshape:rthk.ch6 2group is 香港电台普通话台 3group is None 1group is octoshape:rthk.ch3 2group is 香港电台第三台(英) 3group is None >>> rfile.close() >>> import re >>> rfile=open("tv.txt","r") >>> pat2 = r'([a-z].+?\s)(.+?)((\(.+\)))?' >>> for line in rfile.readlines(): ... Match=re.match(pat1,line) ... print "1group is ",Match.group(1),"2group is ",Match.group(2),"3group is ",Match.group(3) ... 1group is http://202.177.192.119/radio5 2group is 香港电台第五台(可于Totem/VLC/MPlayer播放) 3group is None 1group is http://202.177.192.119/radio35 2group is 香港电台第五台(DAB版,可于Totem/VLC/MPlayer播放) 3group is None 1group is http://202.177.192.119/radiopth 2group is 香港电台普通话台(可于Totem/VLC/MPlayer播放) 3group is None 1group is http://202.177.192.119/radio31 2group is 香港电台普通话台(DAB版,可于Totem/VLC/MPlayer播放) 3group is None 1group is octoshape:rthk.ch1 2group is 香港电台第一台(粤) 3group is None 1group is octoshape:rthk.ch2 2group is 香港电台第二台(粤) 3group is None 1group is octoshape:rthk.ch6 2group is 香港电台普通话台 3group is None 1group is octoshape:rthk.ch3 2group is 香港电台第三台(英) 3group is None 在 2013-02-14 23:43:42,MRAB <pyt...@mrabarnett.plus.com> 写道: >On 2013-02-14 14:13, python wrote: >> my tv.txt is : >> http://202.177.192.119/radio5 香港电台第五台(可于Totem/VLC/MPlayer播放) >> http://202.177.192.119/radio35 香港电台第五台(DAB版,可于Totem/VLC/MPlayer播放) >> http://202.177.192.119/radiopth 香港电台普通话台(可于Totem/VLC/MPlayer播放) >> http://202.177.192.119/radio31 香港电台普通话台(DAB版,可于Totem/VLC/MPlayer播放) >> octoshape:rthk.ch1 香港电台第一台(粤) >> octoshape:rthk.ch2 香港电台第二台(粤) >> octoshape:rthk.ch6 香港电台普通话台 >> octoshape:rthk.ch3 香港电台第三台(英) >> >> what i want to get the result is >> 1group is http://202.177.192.119/radio5 2group is 香港电台第五台 3group is >> (可于Totem/VLC/MPlayer播放) >> 1group is http://202.177.192.119/radio35 2group is 香港电台第五台 3group is >> (DAB版,可于Totem/VLC/MPlayer播放) >> 1group is http://202.177.192.119/radiopth 2group is 香港电台普通话台 3group is >> (可于Totem/VLC/MPlayer播放) >> 1group is http://202.177.192.119/radio31 2group is 香港电台普通话台 3group is >> (DAB版,可于Totem/VLC/MPlayer播放) >> 1group is octoshape:rthk.ch1 2group is 香港电台第一台 3group is (粤) >> 1group is octoshape:rthk.ch2 2group is 香港电台第二台 3group is (粤) >> 1group is octoshape:rthk.ch6 2group is 香港电台普通话台 3group is none >> 1group is octoshape:rthk.ch3 2group is 香港电台第三台 3group is (英) > > >> here is my code: >> # -*- coding: utf-8 -*- >> import re >> rfile=open("tv.txt","r") >> pat=r'([a-z].+?\s)(.+)(\(.+\))' >> for line in rfile.readlines(): >> Match=re.match(pat,line) >> print "1group is ",Match.group(1),"2group is >> ",Match.group(2),"3group is ",Match.group(3) >> rfile.close() >> >> the output is : >> 1group is http://202.177.192.119/radio5 2group is 香港电台第五台 >> 3group is (可于Totem/VLC/MPlayer播放) >> 1group is http://202.177.192.119/radio35 2group is 香港电台第五台 >> 3group is (DAB版,可于Totem/VLC/MPlayer播放) >> 1group is http://202.177.192.119/radiopth 2group is 香港电台普通话台 >> 3group is (可于Totem/VLC/MPlayer播放) >> 1group is http://202.177.192.119/radio31 2group is 香港电台普通话台 >> 3group is (DAB版,可于Totem/VLC/MPlayer播放) >> 1group is octoshape:rthk.ch1 2group is 香港电台第一台 3group is (粤) >> 1group is octoshape:rthk.ch2 2group is 香港电台第二台 3group is (粤) >> 1group is >> Traceback (most recent call last): >> File "tv.py", line 7, in <module> >> print "1group is ",Match.group(1),"2group is ",Match.group(2),"3group >> is ",Match.group(3) >> AttributeError: 'NoneType' object has no attribute 'group' >> >> how to revise my code to get the output? >> >The problem is that the regex makes '(\(.+\))' mandatory, but example 7 >doesn't match it. > >You can make it optional by wrapping it in a non-capturing group >(?:...), like this: > >pat = r'([a-z].+?\s)(.+)(?:(\(.+\)))?' > >Also, it's highly recommended that you use raw string literals >(r'...') when writing regex patterns and replacements. > >-- >http://mail.python.org/mailman/listinfo/python-list
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