的FN：containsIgnoreCase()函数确定的输入字符串是否包含指定的子串。在进行搜索时，它会忽略大小写。
该FN：containsIgnoreCase()函数的语法如下-
boolean containsIgnoreCase(java.lang.String, java.lang.String)
以下是解释fn：containsIgnoreCase()函数功能的示例-
<%@ 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 = "theString" value = "I am a test String"/>
<c:if test = "${fn:containsIgnoreCase(theString, 'test')}">
<p>Found test string<p>
</c:if>
<c:if test = "${fn:containsIgnoreCase(theString, 'TEST')}">
<p>Found TEST string<p>
</c:if>
</body>
</html>您将收到以下结果-
Found test string Found TEST string