The <fn: substringBefore> is function of JSTL which is used to extract the part of the string before the specified substring.
Syntax Of <fn: substringBefore> Tag
String fn: substringBefore(string, substring)
Example
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<! DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ 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>JSTL fn:substringBefore()</title>
</head>
<body>
<c:set var="str" value="hello world!!!! Welcome to JavaBeat"></c:set>
<p>Characters after assigning substring:</p>
${fn:substringBefore(str,'W')}
</body>
</html>
Details of the Code
- < c:set var=”str” value=”hello world!!!! Welcome to JavaBeat”> tag is used to set variable name and to display result in the output using value attribute.
- ${fn: substringBefore(str,’W’)} contains two parameters. First parameter is target string from which we need to derive substring and second parameter is substring which breaks the string and returns the substring before it.
Steps for Execution
- Save the file as substringBeforeExample.jsp in eclipse IDE.
- Now select the jsp file, right click on mouse and select Run as -> Run on Server.
Output
After successful execution of the program we will get the following result:
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JSTL Function fn:substringAfter()