The regex library of matching characters has been growing in Javascript for a while. The Mozilla MDN for RegExp has a breakdown of what is supported, which may be well beyond what most people expect.

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It's been a while since I worked on regexs in JavaScript, but generally the way you do this in most programming languages is to build the regex as a string and then pass it into the regex engine.

A simple npm package that checks the password strength of a certain passphrase. A password strength checker based from Javascript RegEx. This repository contains regular expression (regex) patterns ...

Avoiding Catastrophic Backtracking JavaScript regex implementations in browsers use backtracking to evaluate strings against regular expressions, exploring all potential execution paths.