exec1 returns null if no match was found or an object with information about the match otherwise:
let match = /\d+/.exec("one two 100");
console.log(match);
console.log(match.index);exec1 returns null if no match was found or an object with information about the match otherwise:
let match = /\d+/.exec("one two 100");
console.log(match);
console.log(match.index);