Re: like/ilike improvements

"Zeugswetter Andreas ADI SD" <ZeugswetterA@spardat.at> writes:
>> You have to be on a first byte before you can meaningfully 
>> apply NextChar, and you have to use NextChar or else you 
>> don't count characters correctly (eg "__" must match 2 chars 
>> not 2 bytes).

> Well, for utf8 NextChar could advance to the next char even if the
> current byte
> position is in the middle of a multibyte char (skip over all 10xxxxxx). 

No doubt the macro could be made to work that way, but would it result
in correct matching behavior?  I doubt it --- you just matched an "_"
to half a character, or some such.
        regards, tom lane