javascript replace last occurrence of a letter code example

Example 1: javascript replace last occurrence of a letter

String.prototype.replaceLast = function (search, replace) {
    return this.replace(new RegExp(search+"([^"+search+"]*)$"), replace+"$1");
}

str = "lala";
newStr = str.replaceLast("l", "m");
console.log(newStr);

Example 2: javascript replace last character

var str1 = "Notion,Data,Identity,".replace(/.$/,".")

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