String match()

match() is the same as RegExp object's exec() method. The match() method accepts a regular-expression string or a RegExp object.

The first item of the returning array is the string that matches the entire pattern. Each other item of the returning array represents capturing groups in the expression.

 
<!DOCTYPE html>
<html>
<head>
    <title>Example</title>
    <script type="text/javascript">
    
        var text = "loom, room, doom"; 
        var pattern = /.oo/; 
        
        var matches = text.match(pattern); 
        document.writeln(matches.index); //0 
        document.writeln(matches[0]); //"oo" 
        document.writeln(pattern.lastIndex); //0 
       
    </script>
</head>
<body>
</body>
</html>

Click to view the demo