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Use
memchr
for performance.This code was copy from https://github.com/ruby/ruby/blob/2f2a5c3ae9f9e7a4d09b1500de8d864f48d69cad/re.c#L264-L269
benchmark
$ uname -v Darwin Kernel Version 15.2.0: Fri Nov 13 19:56:56 PST 2015; root:xnu-3248.20.55~2/RELEASE_X86_64
before => 0.000788
after => 0.000508
before => 0.225474
after => 0.008658