javascript replace last occurrence of a letter

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Lucia
09 Jan 2017
1var str1 = "Notion,Data,Identity,".replace(/.$/,".")
2
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Ariana
17 May 2019
1String.prototype.replaceLast = function (search, replace) {
2    return this.replace(new RegExp(search+"([^"+search+"]*)$"), replace+"$1");
3}
4
5str = "lala";
6newStr = str.replaceLast("l", "m");
7console.log(newStr);
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