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Re: non-greedy regexp don't seem to work
From: |
Michael Gerdau |
Subject: |
Re: non-greedy regexp don't seem to work |
Date: |
Fri, 22 May 2015 11:42:46 +0200 |
User-agent: |
KMail/4.14.8 (Linux/4.0.4-1-ARCH; KDE/4.14.8; x86_64; ; ) |
In answering my own post:
> Hi list,
>
> the following two statements should provide the exakt same strings:
> (match:substring (string-match "_(.*?)_" "a_ä_ö_de_fü_") 1)
> (match:substring (string-match "_([^_]*)_" "a_ä_ö_de_fü_") 1)
>
> However for me they don't. Here is a log how I tested it:
> $ guile
> GNU Guile 2.0.11
> Copyright (C) 1995-2014 Free Software Foundation, Inc.
>
> Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
> This program is free software, and you are welcome to redistribute it
> under certain conditions; type `,show c' for details.
>
> Enter `,help' for help.
> scheme@(guile-user)> (match:substring (string-match "_(.*?)_"
> "a_ä_ö_de_fü_") 1)
> $1 = "ä_ö_de_fü"
> scheme@(guile-user)> (match:substring (string-match "_([^_]*)_"
> "a_ä_ö_de_fü_") 1)
> $2 = "ä"
> scheme@(guile-user)> ,q
>
> I checked the same regexps in Perl and there both results are the same.
>
> Am I overlooking the obvious or is this a bug ?
In the archive of the guile-devel ML I found a thread that seems to
indicate that guile simply does not support non-greedy regexp, which
is perfectly in line with my findings of above:
https://www.mail-archive.com/guile-devel%40gnu.org/msg12022.html
Unfortunately the guile manual seems to imply that non-greedy regexp
are indeed supported. See
https://www.gnu.org/software/guile/manual/html_node/Regular-Expressions.html#index-regular-expressions
which directly references Regular expressions used in Emacs which do
support non-greedy regexp.
This is misleading if not an outright documentation bug.
Does anybody know where or how to report this ?
Best wishes,
Michael
--
Michael Gerdau email: address@hidden
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