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Prototype sub() Method
This method returns a string with the first count occurrences of pattern replaced by either a regular string, the returned value of a function or a Template string. pattern can be a string or a regular expression.
Syntax:
string.sub(pattern, replacement[, count = 1]);
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Return Value:
Example:
<html>
<head>
<title>Prototype examples</title>
<script type="text/javascript"
src="/javascript/prototype.js">
</script>
<script>
function showResult(){
var fruits = 'apple pear orange';
alert("fruits.sub(' ', ', '):"+ fruits.sub(' ', ', '));
alert("fruits.sub(' ', ', ', 1): " + fruits.sub(' ', ', ', 1));
alert("fruits.sub(' ', ', ', 2): " + fruits.sub(' ', ', ', 2));
var str = fruits.sub(/\w+/,
function(match){ return match[0].capitalize() + ','}, 2);
alert(str);
}
</script>
</head>
<body>
<p>Click the button to see the result.</p>
<br />
<br />
<input type="button" value="Result" onclick="showResult();"/>
</body>
</html>
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To understand it in better way you can Try it yourself.
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