JSFiddle - React, Tailwind, and code Playground

by Mirosław Hajkowski

HTML

<script>
    //RegExp Tester by MH
    var str = "Alert! Visit W3Schools! http://www.stolmel.pl/index.php/start/main/1/2/321";
    var patt = /2\d/\d+/gi;
    var wynik = str.match(patt);
    var str2 = str.replace(patt, "[replace_by_these_text]");
    document.write(str2);
</script>