Javascript Replace() Function

The replace() function of string object replaces text in a specified string, it will use regular expression to replace text or search string. Use it for example to replace perticuler text in a specified string.

Syntax

str.replace(rgExp, replaceText)

Javascript String Replace() Function Example1

<DOCTYPE html>
<html> 
<head> <!-- www.techstrikers.com -->
<script type="text/javascript">
var str = "Javascript string replace function.";
//Simple text search and replace
document.write(str.replace("function","method") + "</br>");
</script>
</head>
<body>
</body>
</html>

See Live Example

Javascript String Replace Method Example2

<DOCTYPE html>
<html> 
<head> <!-- www.techstrikers.com -->
<script type="text/javascript">
var str = "This is the test of the javascript string replace function.";
var reExp = /the/g;
//This will replace all occurance of "the" in specifide string
document.write(str.replace(reExp,"") + "</br>");
</script>
</head>
<body>
</body>
</html>

See Live Example

Javascript String Replace Method Example3

<DOCTYPE html>
<html> 
<head> <!-- www.techstrikers.com -->
<script type="text/javascript">
var str = "This is test of javascript string replace function.";
var reExp = /(\S+)(\s+)(\S+)/g;
// This will exchange each pair of words.
document.write(str.replace(reExp,"$3$2$1") + "</br>");
</script>
</head>
<body>
</body>
</html>

See Live Example

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