[Octave-bug-tracker] [bug #48377] regex cannot process nested token groups

[Lachlan Andrew]

URL:
  <http://savannah.gnu.org/bugs/?48377>

                 Summary: regex cannot process nested token groups
                 Project: GNU Octave
            Submitted by: lachlan
            Submitted on: Sat 02 Jul 2016 12:17:26 PM GMT
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

I would expect


[S, E, TE, M, T, NM, SP] = regexp ("  abc  def", "(\\s+(\\S+))+");


to give four values in T: "  abc", "abc", "  def", "def".  However, it only
gives two: "  def", "def":


T = 
{
  [1,1] = 
  {
    [1,1] =   def
    [1,2] = def
  }
}


I haven't checked whether Matlab handles nested groups, but if this pattern
isn't handled correctly, it should report an error, rather than giving the
wrong result.




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