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[Octave-bug-tracker] [bug #33258] regexprep with empty replacement gives


From: anonymous
Subject: [Octave-bug-tracker] [bug #33258] regexprep with empty replacement gives an error (not sure what cases)
Date: Sat, 07 May 2011 14:02:58 +0000
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0.1) Gecko/20100101 Firefox/4.0.1

URL:
  <http://savannah.gnu.org/bugs/?33258>

                 Summary: regexprep with empty replacement gives an error (not
sure what cases)
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sat 07 May 2011 02:02:57 PM UTC
                Category: Libraries
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Improvement/Optimization
                  Status: None
             Assigned to: None
         Originator Name: Jochen Weber
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.4.0
        Operating System: Mac OS

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Details:

I stumbled across this error when using the syntax:


TEXTVAR = regexprep(TEXTVAR, '\s*$', '');


If TEXTVAR contains at least one space character at the end, no error occurs.
If, however, no spaces are at the end, I receive an error:


octave-3.4.0:1> TEXTVAR = 'test-input';
octave-3.4.0:2> TEXTVAR = regexprep(TEXTVAR, '\s*$', '');
error: regexprep: internal error calling pcre_exec; error code from pcre_exec
is -24


I understand that the pattern should be more correct:


octave-3.4.0:3> TEXTVAR = 'test-input';
octave-3.4.0:4> TEXTVAR = regexprep(TEXTVAR, '\s+$', '');


which works fine. So I'm not sure how much of a "coding" problem (on my part)
this is, but I would still say that this should not happen:


octave-3.4.0:5> TEXTVAR = 'test-input';
octave-3.4.0:6> TEXTVAR = regexprep(TEXTVAR, 'x*', '');
error: regexprep: internal error calling pcre_exec; error code from pcre_exec
is -24


Matlab handles these cases fine (no replacement, as the pattern is, in effect,
empty). I don't know how much control you have when calling the PCRE library
functions, but I think it would be nice to not have an error thrown if the
pattern resolves to an empty string (hence Item Group
Improvement/Optimization...).

Cheers,
/jochen





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