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Regex matching JS ​

Regular expressions are their own prototype in JS - RegExp.

If you just want to match substrings inside another string:

js
// This has the global flag 'g' set to do multiple matches for a single string
const CAPITAL_LETTERS_PATTERN = /[A-Z]/g;

const fruits = "AppleBananaPomegranateOrange";

// ["A", "B", "P", "O"]
const matches = fruits.match(CAPITAL_LETTERS_PATTERN);

When to use which function ​

Stolen straight from MDN:

  • To know if a string matches (boolean), use .test()
  • To get a single match, use .exec()
  • To get multiple matches, use .match()
  • To get multiple matches using capture groups (the global flag must be set), use .exec() or .matchAll()

INFO

.matchAll() doesn't only return the matches, it instead returns an iterator containing the match and several other bits of information.

See String.prototype.match() - JavaScript | MDN See RegExp.prototype.test() - JavaScript | MDN