From: kai.grossjohann@uni-duisburg.de (Kai Großjohann)
Subject: Re: NON-trivial regular expression problem (could not find on google)
Date: Sat, 18 Jan 2003 22:46:58 +0100 [thread overview]
Message-ID: <84lm1i9lm5.fsf@lucy.is.informatik.uni-duisburg.de> (raw)
In-Reply-To: 7606630f.0301181219.60384da2@posting.google.com
democrat@india.com (Instant Democracy) writes:
> A frequent problem involves simplifying a pathname. The string format we
> can expect to encounter is covered by the following three examples:
>
> "dir.name/../dir/../file"
> "dir/../d2/../file.ext"
> "d1/d2/../../file.ext"
>
> The "" are part of the string, and not just string delimiters. These
> strings are inside regular text on the line. The paths are never
> absolute so that you will not encounter "/d1/file.ext".
>
> The task is to eliminate patterns such as
> DIRNAME/../
> from the path because they are redundant.
Let s be a string such as the above, but without quotes. Then
(expand-file-name s "/")
will return a suitable string, except that it starts with slash.
So in Emacs Lisp, you can do it without regular expressions, but in
three steps:
(1) Remove quotes
(2) Above Lisp expression
(3) Remove leading slash
In Emacs, regular expressions are often not the answer.
--
Ambibibentists unite!
next prev parent reply other threads:[~2003-01-18 21:46 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-18 20:19 NON-trivial regular expression problem (could not find on google) Instant Democracy
2003-01-18 21:38 ` Harry Putnam
2003-01-18 21:46 ` Kai Großjohann [this message]
2003-01-18 22:52 ` AW
2003-01-18 23:03 ` Edi Weitz
2003-01-19 0:27 ` Larry Clapp
2003-01-19 0:36 ` Dr. Yuan Liu
2003-01-19 0:53 ` John W. Krahn
2003-01-19 1:05 ` William Park
2003-01-19 12:17 ` Peter J. Acklam
2003-01-19 19:26 ` Dr. Yuan Liu
2003-01-20 9:15 ` Peter J. Acklam
2003-01-24 18:56 ` Yuan Liu
2003-01-24 11:20 ` Bruce Barnett
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