ESLint: Added regexp/strict rule

[RunDevelopment]

This will disallow regexes with parsing ambiguities.

The ECMAScript specification has a whole chapter on how regex parsing ambiguities are to be resolved. In practice, this means that we might not be required to escape some source characters (e.g. ], {) even though it would improve readability. Parsing without ambiguity is also required to utilize newer regex features like named capturing groups and the Unicode flag.

Adding this rule has two main advantages:

1. Consistent escaping: Source characters (e.g. \[) will always be escaped and non-source characters (e.g. =) are forbidden to be escaped.
2. Forward compatibility: We can just use new regex features if we even want to without having to worry.

Consistent escaping is really nice for code review because a lot of people do unnecessary escaping.

[github-actions]

JS File Size Changes (gzipped)

A total of 46 files have changed, with a combined diff of +24 B (+0.0%).

file	master	pull	size diff	% diff
components/prism-aql.min.js	626 B	627 B	+1 B	+0.2%
components/prism-cfscript.min.js	699 B	698 B	-1 B	-0.1%
components/prism-clojure.min.js	1.4 KB	1.4 KB	-1 B	-0.1%
components/prism-cmake.min.js	4.1 KB	4.1 KB	0 Bytes	0%
components/prism-concurnas.min.js	892 B	893 B	+1 B	+0.1%
components/prism-dataweave.min.js	508 B	508 B	0 Bytes	0%
components/prism-django.min.js	566 B	571 B	+5 B	+0.9%
components/prism-editorconfig.min.js	235 B	236 B	+1 B	+0.4%
components/prism-elm.min.js	596 B	597 B	+1 B	+0.2%
components/prism-gherkin.min.js	5.16 KB	5.16 KB	-1 B	-0.0%
components/prism-graphql.min.js	1.14 KB	1.14 KB	0 Bytes	0%
components/prism-haskell.min.js	1.5 KB	1.5 KB	+1 B	+0.1%
components/prism-hcl.min.js	582 B	585 B	+3 B	+0.5%
components/prism-idris.min.js	377 B	378 B	+1 B	+0.3%
components/prism-iecst.min.js	849 B	848 B	-1 B	-0.1%
components/prism-java.min.js	991 B	989 B	-2 B	-0.2%
components/prism-javascript.min.js	1.49 KB	1.5 KB	+5 B	+0.3%
components/prism-javastacktrace.min.js	613 B	612 B	-1 B	-0.2%
components/prism-jsdoc.min.js	643 B	647 B	+4 B	+0.6%
components/prism-jsstacktrace.min.js	412 B	411 B	-1 B	-0.2%
components/prism-jsx.min.js	961 B	962 B	+1 B	+0.1%
components/prism-markup.min.js	1.03 KB	1.03 KB	-2 B	-0.2%
components/prism-neon.min.js	476 B	475 B	-1 B	-0.2%
components/prism-nevod.min.js	730 B	730 B	0 Bytes	0%
components/prism-nsis.min.js	2.02 KB	2.02 KB	-2 B	-0.1%
components/prism-php.min.js	1.96 KB	1.96 KB	+1 B	+0.1%
components/prism-powershell.min.js	1.25 KB	1.25 KB	-1 B	-0.1%
components/prism-pug.min.js	950 B	950 B	0 Bytes	0%
components/prism-pure.min.js	1.68 KB	1.68 KB	+1 B	+0.1%
components/prism-python.min.js	1.04 KB	1.05 KB	+4 B	+0.4%
components/prism-qsharp.min.js	1.01 KB	1.01 KB	+1 B	+0.1%
components/prism-regex.min.js	597 B	598 B	+1 B	+0.2%
components/prism-sas.min.js	3.01 KB	3.01 KB	-2 B	-0.1%
components/prism-soy.min.js	798 B	801 B	+3 B	+0.4%
components/prism-stylus.min.js	1.61 KB	1.61 KB	0 Bytes	0%
components/prism-tcl.min.js	850 B	852 B	+2 B	+0.2%
components/prism-tt2.min.js	641 B	640 B	-1 B	-0.2%
components/prism-typoscript.min.js	708 B	710 B	+2 B	+0.3%
components/prism-v.min.js	975 B	971 B	-4 B	-0.4%
components/prism-vala.min.js	985 B	986 B	+1 B	+0.1%
components/prism-velocity.min.js	560 B	564 B	+4 B	+0.7%
components/prism-wolfram.min.js	534 B	530 B	-4 B	-0.7%
components/prism-xeora.min.js	563 B	564 B	+1 B	+0.2%
components/prism-xquery.min.js	1.66 KB	1.66 KB	+1 B	+0.1%
components/prism-yaml.min.js	853 B	856 B	+3 B	+0.4%
plugins/autolinker/prism-autolinker.min.js	595 B	595 B	0 Bytes	0%

Generated by 🚫 dangerJS against bdb5d19