String fn:substringBefore(String sourceStr, String beforestring)其中：
<%@ 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"%>
<!DOCTYPE html>
<html>
<head>
<title>编程帮(www.lmcjl.com)</title>
</head>
<body>
<c:set var="msg" value="bianchengbang is a tutorial website" />
${fn:substringBefore(msg, "is")}
</body>
</html>
bianchengbang
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