[bug #28275] grep -P should use PCRE_UTF8

[Paolo Bonzini]

Update of bug #28275 (project grep):

                  Status:                 Invalid => Confirmed              
             Open/Closed:                  Closed => Open                   
                 Summary: Ranges like [a-z] incorrectly match in UTF systems
=> grep -P should use PCRE_UTF8

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Follow-up Comment #8:

That would require conversion to UTF-8 before searching (for non-single-byte,
non-UTF-8 character sets) but it is a good idea.

Yet another thing to rewrite. :-)

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