examples/regex/regexp.html
<script>
var text = 'There is a number 42 in this an another number #123 but nothing else.';
console.log(text);

// var p = new RegExp('\\d+');
// var p = new RegExp(/\d+/);
var p = /\d+/;
console.log(p);
var match = p.exec(text);
if (match) {
   console.log(match);
   console.log(match[0]);
   console.log(match['index']);
   console.log(match['input']);
}
</script>