Crystal: Consider using Hyperscan for Regex

[Piruzzolo]

The library is much faster than PCRE (up to 10-13 times, according to Intel's bechmarks).
It can be found here

[RX14]

And probably does so by dropping features. PCRE is available everywhere, hyperscan not so much. This would be better as a shard.

[asterite]

http://intel.github.io/hyperscan/dev-reference/compilation.html#unsupported-constructs