I'm getting ... 
Is_utf8    My €0.02 of info
Is_utf8    الأنشطة
Benchmark: timing 2 iterations of ara nocmt 1step, ara nocmt 2step, ar
+a w-cmt 1step, ara w-cmt 2step, lat nocmt 1step, lat nocmt 2step, lat
+ w-cmt 1step, lat w-cmt 2step...
ara nocmt 1step:  0 wallclock secs ( 0.00 usr +  0.00 sys =  0.00 CPU)
            (warning: too few iterations for a reliable count)
ara nocmt 2step:  0 wallclock secs ( 0.00 usr +  0.00 sys =  0.00 CPU)
            (warning: too few iterations for a reliable count)
ara w-cmt 1step:  0 wallclock secs ( 0.00 usr +  0.00 sys =  0.00 CPU)
            (warning: too few iterations for a reliable count)
ara w-cmt 2step:  0 wallclock secs ( 0.00 usr +  0.00 sys =  0.00 CPU)
            (warning: too few iterations for a reliable count)
lat nocmt 1step:  0 wallclock secs ( 0.00 usr +  0.00 sys =  0.00 CPU)
            (warning: too few iterations for a reliable count)
lat nocmt 2step:  0 wallclock secs ( 0.00 usr +  0.00 sys =  0.00 CPU)
            (warning: too few iterations for a reliable count)
lat w-cmt 1step:  0 wallclock secs ( 0.00 usr +  0.00 sys =  0.00 CPU)
            (warning: too few iterations for a reliable count)
lat w-cmt 2step:  0 wallclock secs ( 0.00 usr +  0.00 sys =  0.00 CPU)
            (warning: too few iterations for a reliable count)

[download]
... on my slightly out of date 5.12 install.

The fine folks who make this lovely little language of ours have done a *lot* of work on the regex & unicode stuff since in both 5.10 & 5.12. Perhaps you're being bitten by a bug related to your perl version?

TJD

In reply to Re: Very slow regex substitution on Unicode string by Anonymous Monk
in thread Very slow regex substitution on Unicode string by pbijnens

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