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How to check index within a string of a specified substring in JSP?

The fn:indexOf() function returns the index within a string of a specified substring.

Syntax

The fn:indexOf() function has the following syntax −

int indexOf(java.lang.String, java.lang.String)

Example

Following is the example to explain the functionality of the fn:indexOf() function −

<%@ taglib uri = "https://java.sun.com/jsp/jstl/core" prefix = "c" %>
<%@ taglib uri = "https://java.sun.com/jsp/jstl/functions" prefix = "fn" %>
<html>
   <head>
      <title>Using JSTL Functions</title>
   </head>
   <body>
      <c:set var = "string1" value = "This is first String."/>
      <c:set var = "string2" value = "This <abc>is second String.</abc>"/>
      <p>Index (1) : ${fn:indexOf(string1, "first")}</p>
      <p>Index (2) : ${fn:indexOf(string2, "second")}</p>
   </body>
</html>

You will receive the following result −

Index (1) : 8
Index (2) : 13