[Octave-bug-tracker] [bug #62705] Some regex patterns are incorrectly treated as named expressions

[Markus Mützel]

URL:
  <https://savannah.gnu.org/bugs/?62705>

                 Summary: Some regex patterns are incorrectly treated as named
expressions
                 Project: GNU Octave
               Submitter: mmuetzel
               Submitted: Mon 04 Jul 2022 09:31:01 PM CEST
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: dev
         Discussion Lock: Any
        Operating System: Any


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Follow-up Comments:


-------------------------------------------------------
Date: Mon 04 Jul 2022 09:31:01 PM CEST By: Markus Mützel <mmuetzel>
The following patterns are incorrectly classified as named expressions by
Octave. Named expressions are transformed to PCRE syntax. This leads to the
(incorrectly classified) patterns to not match where they should:

regexpi ('<', '\(?<')
regexpi ('<n>', '\(?<n\>')
regexpi ('<n>', '\(?<n\>\)?')
regexpi ('<n>a', '\(?<n\>a\)?')


IIUC, all of these should return `1`. But they return `[]` (or crash or emit
an error before the fix for bug #62704).

I have a fix for some of those ready that I'll push when I have a bug number.








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