keep only last word from string javascript code example

Example 1: javascript get last word in string

// strips all punctuation and returns the last word of a string
// hyphens (-) aren't stripped, add the hyphen to the regex to strip it as well
function lastWord(words) {
    let n = words.replace(/[\[\]?.,\/#!$%\^&\*;:{}=\\|_~()]/g, "").split(" ");
    return n[n.length - 1];
}

Example 2: inbuilt javascript functions for last word check

function test(words) {

var n = words.indexOf(" ");
var res = words.substring(n+1,-1);
return res;

}