JSTL Function fn:indexOf Example

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Last Updated on 31 August 2019   |   Print  Email


In this post, I will help you undestand how to use the <fn:indexOf> tag in the JSTL function tags library with code example.

The fn:indexOf function returns the index of the first occurrence of a substring in a given string. The index starts at ‘0’.

 

JSTL <fn:indexOf> Syntax:

${fn:indexOf(<var containing string to search for substring>,<substring>)}

 

JSTL <fn:indexOf> Example:

The following code snippet searches for a substring ‘JSTL’ and prints its index in a given string.

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>fn:indexOf Demo</title>
  </head>
  <body>
	<h1>fn:indexOf Demo</h1>

	<c:set var="text" value="The JSTL Functions Are Great." />
	<c:out value="${text}"/>
	<p>Index of 'JSTL' from above text is: ${fn:indexOf(text,'JSTL')}</p>
  </body>
</html>

 

Output:

JSTL function fn-indexOf

 

Other JSTL Function Tags:

contains  |  containsIgnoreCase  |  endsWith |  escapeXml  |  join  |  length  |  replace  |  split  |  startsWith  |  substring  |  substringAfter  |  substringBefore  |  toLowercase  |  toUpperCase  |  trim


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is certified Java programmer (SCJP and SCWCD). He started programming with Java in the time of Java 1.4 and has been falling in love with Java since then. Make friend with him on Facebook and watch his Java videos you YouTube.



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