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http://bugs.exim.org/show_bug.cgi?id=1288
Summary: Performance issue using C++ interface with UTF-8 enabled
Product: PCRE
Version: N/A
Platform: All
OS/Version: All
Status: NEW
Severity: bug
Priority: high
Component: Code
AssignedTo: ph10@???
ReportedBy: toth.tamas@???
CC: pcre-dev@???
In RE::TryMatch method at pcrecpp.cc line 524 (in version 8.31) exec options
defaults to 0 and later only PCRE_ANCHORED and PCRE_NOTEMPTY can be added. This
way there is no way to set PCRE_NO_UTF8_CHECK flag in exec options which can
cause serious performance issues processing large files.
My suggested patch is changing line
int options = 0;
to
int options = (options_.all_options() & PCRE_NO_UTF8_CHECK);
This way no interface modification is required and UTF-8 checking automatically
skipped if user has set the PCRE_NO_UTF8_CHECK in RE class. Not setting this in
RE will cause minimal performance loss during regexp parsing and keeps exec
safe.
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