JSTL fn:replace() Function

Last Updated : 24 Apr, 2025

The JSTL fn:replace() function or method in JSP (Java Server Pages) is mainly used for the manipulation of strings. This function allows developers to replace the occurrence of a specified substring with another substring in the given input string. This article will see the Syntax, parameters, and two practical examples of the fn:replace() function. We need to note that the replace function performs case-sensitive processing of string.

Syntax of fn:replace()

${fn:replace(sourceString, targetSubstring, replacementSubstring)}

Where,

sourceString: This is the input or original string in which the replacement or modification is to be done.
targetSubstring: This is the substring to be replaced in the sourceString.
replacementSubstring: This is the substring that will mainly replace occurrences in the targetSubstring in the sourceString.

Example of fn:replace() function

Below is the implementation of the fn:replace() function:

HTML

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<html>
<head>
    <title>JSTL fn:replace() Example</title>
</head>
<body>
<c:set var="originalString" value="GeeksforGeeks is a platform for computer science students. 
                                   GeeksforGeeks is good." />
<p>Original String: ${originalString}</p>
<c:set var="modifiedString" value="${fn:replace(originalString, 'GeeksforGeeks', 'GFG')}"/>
<p>Modified String: ${modifiedString}</p>
</body>
</html>

Output:

Original String: GeeksforGeeks is a platform for computer science students. GeeksforGeeks is good.
Modified String: GFG is a platform for computer science students. GFG is good.

Final Output Shown in the Browser:

Output_of_of-fn:replace()-function

Explanation of the above Program:

In the above example, we have initialised the "originalString" variable with the text.
Then, we used the "fn:replace()" function to replace the occurrences of "GeeksforGeeks" with the "GFG" in the originalString variable.
The replaced string is been saved in the "modifiedString" variable and we are printing it on screen using <p> tag in HTML.

JSTL fn:trim() Function

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Java

JSTL fn:replace() Function

Syntax of fn:replace()

Example of fn:replace() function

Output:

Final Output Shown in the Browser:

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