JavaScript - what is \W regex / '\w' and '\W' difference ?

\w - /\w/ - matches any word character (shortcut for [a-zA-Z_0-9]).

\W - /\W/ - matches any character that is not a word character (shortcut for [^\w]).

Practical example that shows how to extract \w and \W characters from any string:

// ONLINE-RUNNER:browser;

const text = 'abc-123?';

const result1 = text.match(/\w/g);
const result2 = text.match(/\W/g);

if (result1) {
	console.log(result1);  // ['a', 'b', 'c', 1, 2, 3]
}

if (result2) {
	console.log(result2);  // ['-', '?']
}