To match an expression, use the JavaScript match() method. This method is used to retrieve matches when matching a string with a regular expression. The following are the parameters -
If the regular expression does not contain the g flag, it returns the same result as regexp.exec(string).
If the regular expression contains the g flag, this method returns an array containing all matches.
You can try running the following code to perform mathematical operations on expressions using JavaScript regular expressions -
<html>
<head>
<title>JavaScript String match() Method</title>
</head>
<body>
<script>
var str = "For more information, see Chapter 3.4.5.1";
var re = /(chapter \d+(\.\d)*)/i;
var found = str.match( re );
document.write(found );
</script>
</body>
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