JSTL fn:containsIgnoreCase() Function

JSTL containsIgnoreCase Function returns true or false based on condition evaluation. “fn:containsIgnoreCase This function is used to check if the “string” contains the specified “subtsring” no matter the case of the string and substring. The function returns true if the substring is present and false if not.

Syntax:

boolean containsIgnoreCase(java.lang.String, java.lang.String)

JST containsIgnoreCase Function Example:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>JSTL containsIgnoreCase Function Example</title>
</head>
<body>
  <c:out value="${fn:containsIgnoreCase('dineshonjava', 'DIneS')}"/>
</body>
</html>

Output: true

As you can see above, fn:containsIgnoreCase() takes two Strings as input parameters.

First parameter in JSTL containsIgnoreCase function is the String which needs to be checked to see if it contains second String, ignoring the cases.

<%@ 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 good programmer"/>  
      
    <c:if test="${fn:containsIgnoreCase(theString, 'good')}">  
       <p>Found good string<p>  
    </c:if>  
      
    <c:if test="${fn:containsIgnoreCase(theString, 'GOOD')}">  
       <p>Found GOOD string<p>  
    </c:if>  
      
    </body>  
    </html>

Output:
Found good string
Found GOOD string

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Dinesh Rajput

Dinesh Rajput is the chief editor of a website Dineshonjava, a technical blog dedicated to the Spring and Java technologies. It has a series of articles related to Java technologies. Dinesh has been a Spring enthusiast since 2008 and is a Pivotal Certified Spring Professional, an author of a book Spring 5 Design Pattern, and a blogger. He has more than 10 years of experience with different aspects of Spring and Java design and development. His core expertise lies in the latest version of Spring Framework, Spring Boot, Spring Security, creating REST APIs, Microservice Architecture, Reactive Pattern, Spring AOP, Design Patterns, Struts, Hibernate, Web Services, Spring Batch, Cassandra, MongoDB, and Web Application Design and Architecture. He is currently working as a technology manager at a leading product and web development company. He worked as a developer and tech lead at the Bennett, Coleman & Co. Ltd and was the first developer in his previous company, Paytm. Dinesh is passionate about the latest Java technologies and loves to write technical blogs related to it. He is a very active member of the Java and Spring community on different forums. When it comes to the Spring Framework and Java, Dinesh tops the list!