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The fn:substring() function returns a substring from a string at specified start and end indices.
fn:substring() Function Syntax
${fn:substring(<string>, <beginIndex>, <endIndex>)}
The following example demonstrates the function's functionality:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<html>
<head>
<title>Using JSTL Functions</title>
</head>
<body>
<c:set var="string1" value="This is first String."/>
<c:set var="string2" value="${fn:substring(string1, 5, 15)}" />
<p>The generated substring is : ${string2}<//p>
</body>
</html>
The running result is as follows:
The generated substring is : is first S