To use JavaScript RegExp to match any single character in a given set, use the [aeiou] metacharacter.
<html>
<head>
<title>JavaScript Regular Expression</title>
</head>
<body>
<script>
var myStr = "Welcome to our website!";
var reg = /[we]/g;
var match = myStr.match(reg);
document.write(match);
</script>
</body>
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