How to know if JavaScript string.replace() did anything?

Question

The replace function returns the new string with the replaces, but if there weren\'t any words to replace, then the original string is returned. Is there a way to k

Answer 1

Use .test()

const regex = /foo/;
const yourString = 'foo bar';

if (regex.test(yourString)) {
  console.log('yourString contains regex');
}

The test() method executes a search for a match between a regular expression and a specified string. Returns true or false.