[Octave-bug-tracker] [bug #60541] Copying a returned variable from regexp results in an error message

[Markus Mützel]

Update of bug #60541 (project octave):

                  Status:                    None => Invalid                
             Open/Closed:                    Open => Closed                 
        Operating System:               GNU/Linux => Any                    

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Follow-up Comment #1:

Confirmed with Octave 6.2.0 on Windows.

Fwiw, with Matlab R2021a:

>> [S, E, TE, M, T, NM, SP] = regexp('YYYx', 'x(?<vvv>[^x]*)x');
>> xx=NM.vvv
Insufficient number of outputs from right hand side of equal sign to satisfy
assignment.
 
>> 


So Octave seems to be compatible with this respect.

IIUC, `NM.vvv` returns an empty comma-separated-list if `NM` is empty. Hence,
it cannot be assigned to a variable.
See also: https://octave.org/doc/v6.2.0/Comma-Separated-Lists.html

The following is valid syntax:

[S, E, TE, M, T, NM, SP] = regexp('YYYx', 'x(?<vvv>[^x]*)x');
xx = {NM.vvv}


The braces in the last assignment convert the cs-list to a cell which is
allowed to be empty in an assignment.


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