JuliaLang/julia — comment on commit 284919152afe72f6b7caa3949a0e894248e4a662
File:  line 0
By StefanKarpinski:

Well, it's central in the sense that it's not a feature you can leave out. If PCRE is compiled with the wrong options or doesn't support the same options as the ones we expect, regex support will just break. For example, we definitely need Unicode support turned on. I have no idea why the hashing tests would fail with this change. Strange.