Smaller regex using regexgen

[devongovett]

regexgen is a package I wrote which generates regular expressions from a list of strings, similar to regex-trie. However, it applies some additional algorithms to generate smaller regular expressions. You can read about how it works in the readme.

For emoji-regex, the generated regex goes from 3.55 KB to 2.85 KB in size (a ~20% reduction). Also, the build script is simpler since regexgen uses regenerate for character class generation already, so no need to generate two separate parts.

[mathiasbynens]

@devongovett This looks great, as does regexgen! 👍

The CI build is failing because of the old support matrix. I’ll drop support for old Node.js versions first and then merge this!

[mathiasbynens]

Done. Could you please rebase this?

[coveralls]

Coverage remained the same at 100.0% when pulling f3298da2d48e45e1ef816a459356cc6d39790cb7 on devongovett:regexgen into edd87c3da5fe0dd1e9d8722b247ad08bd410aaaa on mathiasbynens:master.

[devongovett]

Done!