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JavaScript RegExp ignoreCase Property

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  • Last Updated : 06 Jan, 2023
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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




<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>

Output: 

JavaScript RegExp ignoreCase Property

JavaScript RegExp ignoreCase Property

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

html




<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>

Output: 

JavaScript RegExp ignoreCase Property

JavaScript RegExp ignoreCase Property

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

We have a complete list of Javascript RegExp expressions, to check those please go through this JavaScript RegExp Complete Reference article.

We have a Cheat Sheet on Javascript where we covered all the important topics of Javascript to check those please go through Javascript Cheat Sheet-A Basic guide to JavaScript.  


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