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:
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