JSTL Function Tags List

The JSTL function provides a number of standard functions, most of these functions are common string manipulation functions. 
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The syntax used for including JSTL function library in your JSP is:
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>

JSTL Function Tags List

Let's list out all the JSTL function tags with its meaning.
  1. fn(): This function checks whether the given string is present in the input as sub-string. It does a case sensitive check.
  2. fn:containsIgnoreCase(): It does a case-insensitive check to see whether the provided string is a sub-string of input.
  3. fn:indexOf(): It is used for finding out the start position of a string in the provided string. The function returns -1 when a string is not found in the input.
  4. fn:escapeXML(): It is used for HTML/XML character escaping which means it treats html/xml tags as a string. Similar to the escapeXml attribute of <c:out> tag.
  5. fn:join() and fn:split() functions: JSTL functions: fn:join() concatenates the strings with a given separator and returns the output string. fn:split() splits a given string into an array of substrings.
  6. fn:length(): The JSTL function fn: length() is used for computing the length of a string or to find out the number of elements in a collection. It returns the length of the object.
  7. fn:startsWith(): It checks the specified string is a prefix of a given string.
  8. fn:endsWith(): fn:endsWith() JSTL function is used for checking the suffix of a string. It checks whether the given string ends with a particular string.
  9. fn:substring(): This JSTL function is used for getting a substring from the provided string.
  10. fn:substringAfter(): It is used for getting a substring that is present in the input string before a specified string.
  11. fn:substringBefore(): It gets a substring from the input which comes after a specified string.
  12. fn:trim(): JSTL Function fn:trim() removes spaces from beginning and end of a string and function.
  13. fn:toUpperCase(): It is just opposite of fn:toLowerCase() function. It converts input string to an uppercase string.
  14. fn:toLowerCase(): This function is used for converting an input string to a lower case string.
  15. fn:replace(): fn:replace() function search for a string in the input and replace it with the provided string. It does case-sensitive processing.
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