JSTL fn: indexOf () function
fn: indexOf () function returns a string in the specified substring position.
grammar
fn: Syntax indexOf () function is as follows:
${fn:indexOf(<原始字符串>,<子字符串>)}
Examples Demo
The following examples demonstrate the capabilities 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>
Results are as follows:
Index (1) : 8 Index (2) : 13