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http://bugs.exim.org/show_bug.cgi?id=1419 --- Comment #15 from Ben Maurer <[email protected]> 2013-12-16 10:04:42 --- We use PCRE in HHVM (our implementation of PHP). Since PHP uses PCRE, the main goal in using PCRE was compatability. PCRE is a great choice of library for us and serves us very well. We've recently been experimenting with using the JIT to increase regex performance. In this particular case, I noticed though some of our internal profiling tools that a set of regexes which filtered Emoji from UTF8 encoded strings seemed to be taking an unusually large amount of time. I was able to isolate it down to the example I attached to this bug. For us, any work that increases performance is very useful. While PCRE isn't a huge overall percentage of our runtime, a large infrastructures provides a lot of leverage -- a gain might be small as a percentage of our infrastructure, but still meaningful in absolute terms. -- Configure bugmail: http://bugs.exim.org/userprefs.cgi?tab=email -- ## List details at https://lists.exim.org/mailman/listinfo/pcre-dev
