bugGNU Octave - Bugs: bug #39424, regexp: nested parentheses returns...

 
 

bug #39424: regexp: nested parentheses returns more tokens than Matlab

Submitter:  Rik <rik5>
Submitted:  Sun 07 Jul 2013 09:52:48 PM UTC
 
Category:  Libraries Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Matlab Compatibility
Status:  Confirmed Assigned to:  None
Originator Name:  Open/Closed:  * Open
Release:  * dev Operating System:  * Any
Fixed Release:  None Planned Release:  None
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Mon 21 Nov 2016 10:14:47 PM UTC, comment #1: 

Octave still behaves the same in version 4.2.0.

Hartmut <hardy>
Sun 07 Jul 2013 09:52:48 PM UTC, original submission:  

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.

Rik <rik5>
Project Administrator

 

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