[Octave-bug-tracker] [bug #38149] regexp doesn't return empty tokens -- they just disappear

[Michael Godfrey]

Follow-up Comment #14, bug #38149 (project octave):

Better, I'd say:

>> te = regexp ('abc', 'abc(z?)', 'tokenExtents');
>> celldisp (te)
 
te{1} =
 
     4     3

 
>> 
>> te = regexp ('abce', '((a)(z)?b(c)(z*))(z)?(e)?', 'tokenExtents');
>> celldisp (te)
 
te{1} =
 
     1     3
     4     3
     4     4

 
>> 
>> [T, TE, NM] = regexp (sprintf('%s','John DavisnRogers, James'),
'(?<first>w+)s+(?<last>w+)|(?<last>w+),s+(?<first>w+)', 'tokens',
'tokenExtents', 'names');
>> 
>> celldisp (T)
 
T{1}{1} =
 
John
 
 
T{1}{2} =
 
Davis
 
 
T{2}{1} =
 
nRogers
 
 
T{2}{2} =
 
James
 
>> celldisp (TE)
 
TE{1} =
 
     1     4
     6    10

 
 
TE{2} =
 
    12    18
    21    25

 
>> NM(1).first

ans =

John

>> NM(1).last

ans =

Davis

>> NM(2).first

ans =

James

>> NM(2).last

ans =

nRogers

>> 


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