Add regex plugins

[fregante]

eslint-plugin-no-unsafe-regex

"unsafe regex" as defined by substack/safe-regex

detect possibly catastrophic, exponential-time regular expressions

Examples of bad regexes:

/^(a?){25}(a){25}$/,
RegExp(Array(27).join('a?') + Array(27).join('a')),
/(x+x+)+y/,
/foo|(x+x+)+y/,
/(a+){10}y/,
/(a+){2}y/,
/(.*){1,32000}[bc]/

eslint-plugin-optimize-regex

Example

/[a-zA-Z_0-9][A-Z_\\da-z]*\\e{1,}/ can be optimized to /\\w+e+/

[sindresorhus]

Yeah. Looks useful. Pull request welcomez.

[bdougherty]

So the regex-shorthand rule covers some of the cases for optimize-regex, but it's simpler so it doesn't cover everything.

The author of the optimize-regex plugin is open to a PR that fixes node 4 compatibility, so I can do that if you're still open to adding that plugin. Otherwise, I can add a rule to eslint-plugin-unicorn that uses regexp-tree. In that case it may be better to replace or update the existing rule.

[fregante]

These have been added (but the first one was removed)