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JavaScript | RegExp ignoreCase Property

  • Last Updated : 30 Sep, 2021

The RegExp ignoreCase property in JavaScript is used to specify whether the “i” modifier is set or not. If the “i” modifier is set than this property returns true otherwise returns false.
Syntax: 
 

RegexObj.ignoreCase

Return Value: It returns true if i modifier is set, else false.
Example 1: This example checks if the regular expression contains i Modifier or not. 
 

html




<!DOCTYPE html>
<html>
    <head>
        <title>
            RegExp ignoreCase Property
        </title>
    </head>
     
    <body style="text-align:center">
         
        <h1 style="color:green">
            GeeksforGeeks
        </h1>
         
        <h2>ignoreCase Property</h2>
         
        <button onclick="geek()">
            Click it!
        </button>
 
        <script>
            function geek() {
                var regex = new RegExp('foo', 'i');
                alert(regex.ignoreCase);
            }
        </script>
    </body>
</html>                   

Output: 
Before clicking the button: 
 

ignoreCase

After clicking the button: 
 

ignoreCase

Example 2: This example checks the regular expression contains i Modifier or not. 
 

html




<!DOCTYPE html>
<html>
 
<head>
    <title>
        JavaScript ignoreCase Property
    </title>
</head>
 
<body style="text-align:center">
     
    <h1 style="color:green">
        GeeksforGeeks
    </h1>
     
    <h2>
        ignoreCase Property
    </h2>
     
    <button onclick="geek()">
        Click it!
    </button>
 
    <script>
        function geek() {
            var regex = /[a-d]/;
            var str =
                "GeeksforGeeks\n"+
                "is the computer\n"+
                "science portal for geeks.";
             
            if (regex.ignoreCase) {
                alert("i Modifier is present");
            } else {
                alert("i Modifier is absent.");
            }
        }
    </script>
</body>
 
</html>                   

Output: 
Before clicking the button: 
 

ignoreCase

After clicking the button: 
 

ignoreCase

Supported Browsers: The browsers supported by JavaScript ignoreCase property are listed below: 
 

  • Google Chrome 1 and above
  • Edge 12 and above
  • Firefox 1 and above
  • Internet Explorer  5.5 and above
  • Opera 5 and above
  • Safari 1 and above

 

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