Javascript RegExp - exec Method

Description:

The exec method searches string for text that matches regexp. If it finds a match, it returns an array of results; otherwise, it returns null.

Syntax:

RegExpObject.exec( string );

Here is the detail of parameters:

string : The string to be searched

Return Value:

Returns the matched text if a match is found, and null if not.

Example:

<html>
<head>
<title>JavaScript RegExp exec Method</title>
</head>
<body>
<script type="text/javascript">
   var str = "Javascript is an interesting scripting language";
   var re = new RegExp( "script", "g" );

   var result = re.exec(str);
   document.write("Test 1 - returned value : " +  result); 

   re = new RegExp( "pushing", "g" );
   var result = re.exec(str);
   document.write("<br />Test 2 - returned value : " +  result); 
</script>
</body>
</html>

This will produce following result:

Test 1 - returned value : script
Test 2 - returned value : null

To understand it in better way you can Try it yourself.