[pcre-dev] [Bug 1419] PCRE slower at matching UTF8 character…

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Auteur: Zoltan Herczeg
Date:  
À: pcre-dev
Sujet: [pcre-dev] [Bug 1419] PCRE slower at matching UTF8 character classes.
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http://bugs.exim.org/show_bug.cgi?id=1419

Zoltan Herczeg <hzmester@???> changed:

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--- Comment #4 from Zoltan Herczeg <hzmester@???> 2013-12-15 08:13:32 ---
I see something similar on my machine.

The reasons:
-with utf8, [b-z]: there is an ACROSSCHAR call at while (start_match <
end_subject) loop, which might be unnecessary, since the bits should never been
set for non-starting UTF8 characters (128-192).

-with utf8, [\x{fe000}-\x{fefff}]: XCLASS is not recognized by PCRE study. I
once proposed that the bit set of XCLASS should contain all bits for chars <
256, but it is too taxing for unicode properties. Maybe we could do this when
no properties are present in the XCLASS.


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