Function Taglib

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The function taglib contains the basic String functions for the JSTL functionality.

Standard Syntax:

<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>

Return Type	Method	Description
boolean	contains ( java.lang.String, java.lang.String)	Tests if an input string contains the specified substring.
boolean	containsIgnoreCase ( java.lang.String, java.lang.String)	Tests if an input string contains the specified substring in a case insensitive way.
boolean	endsWith ( java.lang.String, java.lang.String)	Tests if an input string ends with the specified suffix.
java.lang.String	escapeXml ( java.lang.String)	Escapes characters that could be interpreted as XML markup.
int	indexOf ( java.lang.String, java.lang.String)	Returns the index withing a string of the first occurrence of a specified substring.
java.lang.String	join ( java.lang.String[], java.lang.String)	Joins all elements of an array into a string.
int	length ( java.lang.Object)	Returns the number of items in a collection, or the number of characters in a string.
java.lang.String	replace ( java.lang.String, java.lang.String, java.lang.String)	Returns a string resulting from replacing in an input string all occurrences of a "before" string into an "after" substring.
java.lang.String[]	split ( java.lang.String, java.lang.String)	Splits a string into an array of substrings.
boolean	startsWith ( java.lang.String, java.lang.String)	Tests if an input string starts with the specified prefix.
java.lang.String	substring ( java.lang.String, int, int)	Returns a subset of a string.
java.lang.String	substringAfter ( java.lang.String, java.lang.String)	Returns a subset of a string following a specific substring.
java.lang.String	substringBefore ( java.lang.String, java.lang.String)	Returns a subset of a string before a specific substring.
java.lang.String	toLowerCase ( java.lang.String)	Converts all of the characters of a string to lower case.
java.lang.String	toUpperCase ( java.lang.String)	Converts all of the characters of a string to upper case.
java.lang.String	trim ( java.lang.String)	Removes white spaces from both ends of a string.

Example:-

<%@ taglib uri="/WEB-INF/fn.tld" prefix="fn" %>
<%@ taglib uri="/WEB-INF/c.tld" prefix="c" %>
 <c:set var="test" value="This is the test String"/>
 Index of i is :- ${fn:indexOf(test, "i")} 
 Substring Function:- ${fn:substring(test, 3,10)} 
 Upper Case :- ${fn:toUpperCase(test)} 
 Lower Case:- ${fn:toLowerCase(test)} 
 Replace Function:- ${fn:replace(test,"the","a")} 
 contains Function:- ${fn:contains(test,"the")}