[Octave-bug-tracker] [bug #39424] regexp: nested parentheses returns more tokens than Matlab

[Rik]

URL:
  <http://savannah.gnu.org/bugs/?39424>

                 Summary: regexp: nested parentheses returns more tokens than
Matlab
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Sun 07 Jul 2013 02:52:48 PM PDT
                Category: Libraries
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: Confirmed
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

According to Matlab documentation,


Note:   If an expression has nested parentheses, MATLAB captures tokens that
correspond to the outermost set of parentheses. For example, given the search
pattern '(and(y|rew))', MATLAB creates a token for 'andrew' but not for 'y' or
'rew'.


Octave, following PCRE, creates a token for every subpattern which matches.


regexp ('andrew', '(and(y|rew))', 'tokens')
ans = 
{
  [1,1] = 
  {
    [1,1] = andrew
    [1,2] = rew
  }
}


The solution probably means re-writing the pattern before passing it off to
PCRE.





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