matchAll() is a new method added to String prototype. It works similar to Regular Expression. The method returns an iterator. The iterator returns all matches one after other.
const regExp = /world/g;
const str = "This world is a beautiful world";
const iterator = str.matchAll(regExp);
for (const match of iterator) {
console.log(match);
}The match will be an object containing information like the input string and position of the match.
Output: .matchAll()
Here we used for...of to loop through the iterator. We can also use array spread and Array.from(). And for the regular expression, the ending /g is mandatory. Otherwise, .matchAll() throws TypeError.