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
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