JSP Database Connection JSP Standard Tag Library (JSTL)

JSTL fn:indexOf() function

fn:indexOf() function returns the position of a specified substring in a string.

Syntax

fn:indexOf() function syntax is as follows:

${fn:indexOf(<original string>,<substring>)}

Example Demonstration

The following example demonstrates the function of this function:

<%@ 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="This  <abc>is second String.</abc>"/>
<p>Index (1)  :  ${fn:indexOf(string1,  "first")</p>
<p>Index (2)  :  ${fn:indexOf(string2,  "second")</p>
</body>
</html>

The running results are as follows:

Index (1)  :　8
Index (2)  :　13

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JSTL fn:indexOf() function

Syntax

Example Demonstration