Jstl length

<%@ 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>JSTL fn:length() example</title>  
</head>  
<body>  
<c:set var="str1" value="This is first string"/>  
<c:set var="str2" value="Hello"/>  
Length of the String-1 is: ${fn:length(str1)}<br>  
Length of the String-2 is: ${fn:length(str2)}  
</body>  
</html>

Source: javatpoint.com

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