JSTL fn:indexOf() function

The JSTL fn:indexOf() function returns the start position of the specified string in the input string. It returns -1 if specified string not found in the input string.

Syntax:

int indexOf(String inputString, String specifiedString)

Example:

test.jsp

<%@ 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>fn:indexOf JSTL function example</title>
	</head>
	<body>
		<c:set var="testString" 
                         value="Hello this is a JSTL function example"/>
		Index of JSTL in the String: 
		<c:out value="${fn:indexOf(testString, 'JSTL')}" /><br/>
	</body>
</html>

web.xml

<web-app>
 
  <welcome-file-list>
          <welcome-file>test.jsp</welcome-file>
  </welcome-file-list>	
 
</web-app>

Output:

jsp example 57

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