[Octave-bug-tracker] [bug #57107] regexp functions fail on ISO-8859-1 input

[Markus Mützel]

Follow-up Comment #43, bug #57107 (project octave):


> My question is if the search pattern is purely single-byte patterns (say
ascii only), does regexp input string must be a valid utf-8 string? I don't
see this could ever be a problem. no?

This test containing only ASCII characters in the pattern:

regexp('aäiöü', '[^\w]')


In Octave 4.4.1:

>> test_regexp_utf8

ans =

   2   3   5   6   7   8


In Octave 6.4.0:

>> test_regexp_utf8

ans =

   2   5   7


The old result was wrong (pointing to second bytes of a character). There
should be only three matches like in newer versions of Octave.


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