Re: [Tutor] regular expression matching a dot?
Hi [Christian|List] This post is not regarding your special problem (which anyway has been solved by now), but I'd like to share some general tip on working with regular expressions. There are some nice regex-debuggers out there that can help clearify what went wrong when a regex doesn't match when it should or vice versa. Kodos http://kodos.sourceforge.net/ is one of them, but there are many others that can make your life easier ; at least in terms of regex-debugging ;) Probably most of you (especially all regex-gurus) know about this already, but i thought it was worth the post as a hint for all beginners hth Frank On Wed, 2005-10-19 at 09:45 +0200, Christian Meesters wrote: Hi I've got the problem that I need to find a certain group of file names within a lot of different file names. Those I want to match with a regular expression are a bit peculiar since they all look like: ... ...(regex-problem) ... Any ideas what I could do else? TIA Christian PS Hope that I described the problem well enough ... ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] regular expression matching a dot?
I personally fancy Kiki, that comes with the WxPython installer... It has very nice coloring for grouping in Regexes. Hugo Kent Johnson wrote: Frank Bloeink wrote: There are some nice regex-debuggers out there that can help clearify what went wrong when a regex doesn't match when it should or vice versa. Kodos http://kodos.sourceforge.net/ is one of them, but there are many others that can make your life easier ; at least in terms of regex-debugging ;) Yes, these programs can be very helpful. There is even one that ships with Python - see C:\Python24\Tools\Scripts\redemo.py Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] regular expression matching a dot?
Hi I've got the problem that I need to find a certain group of file names within a lot of different file names. Those I want to match with a regular expression are a bit peculiar since they all look like: 07SS.INF , 10SE.INF, 13SS.INF, 02BS.INF, 05SS.INF. Unfortunately there are similar file names that shouldn't be matched, like: 01BE.INF, 02BS.INF Any other extension than 'INF' should also be skipped. (There are names like 07SS.E00, wich I don't want to see matched.) So I tried the following pattern (using re): \d+[SS|SE]\.INF - as there should be at least one digit, the group 'SE' or 'SS' followed by a dot and the extension 'INF'. Well, this doesn't work, no match. However, if I change the pattern to \d+[SS|SE] it somehow works and all all valid names are matched. But if there is a different extension than 'INF' it matches too - but it shouldn't. (Surrounding the dot with [] doesn't help, though I have no idea as for why.) Any ideas what I could do else? TIA Christian PS Hope that I described the problem well enough ... ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] regular expression matching a dot?
Christian Meesters wrote: Hi I've got the problem that I need to find a certain group of file names within a lot of different file names. Those I want to match with a regular expression are a bit peculiar since they all look like: 07SS.INF , 10SE.INF, 13SS.INF, 02BS.INF, 05SS.INF. Unfortunately there are similar file names that shouldn't be matched, like: 01BE.INF, 02BS.INF Any other extension than 'INF' should also be skipped. (There are names like 07SS.E00, wich I don't want to see matched.) So I tried the following pattern (using re): \d+[SS|SE]\.INF - as there should be at least one digit, the group 'SE' or 'SS' followed by a dot and the extension 'INF'. Use parentheses () for grouping. Brackets [] define a group of characters. Your re says to match \d+ one or more digits [SS|SE] exactly one of the characters S, |, E \.INF literal .INF Since there are TWO characters S or E, nothing matches. Change the [] to () and it works. Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] regular expression matching a dot?
[ Workaround ]
What about using the glob module?
http://docs.python.org/lib/module-glob.html
you can use something like
glob.glob('./[0-9][0-9]S[E|S].INF')
(Not tested)
Misto
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Re: [Tutor] regular expression matching a dot?
Actually, your answer did help to open my eyes. The expression is
\d+S[S|E]\.INF: Ouch!
Thanks a lot,
Christian
On 19 Oct 2005, at 12:11, Misto . wrote:
[ Workaround ]
What about using the glob module?
http://docs.python.org/lib/module-glob.html
you can use something like
glob.glob('./[0-9][0-9]S[E|S].INF')
(Not tested)
Misto
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Re: [Tutor] regular expression matching a dot?
Christian Meesters wrote: Actually, your answer did help to open my eyes. The expression is \d+S[S|E]\.INF: Ouch! That will work, but what you really mean is one of these: \d+S[SE]\.INF \d+S(S|E)\.INF Your regex will match 0S|.INF Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] regular expression matching a dot?
Thanks, corrected. I was happy now - and then too fast ;-). Cheers Christian On 19 Oct 2005, at 13:50, Kent Johnson wrote: Christian Meesters wrote: Actually, your answer did help to open my eyes. The expression is \d+S[S|E]\.INF: Ouch! That will work, but what you really mean is one of these: \d+S[SE]\.INF \d+S(S|E)\.INF Your regex will match 0S|.INF Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
