JavaScript RegExp i Modifier

The RegExp i Modifier in JavaScript is used to perform case-insensitive matching in the string. 

Syntax: 

/regexp/i 

or

new RegExp("regexp", "i")

Example 1: This example matches the word “geeks” or “Geeks” (case insensitive) and displays it. 

Javascript

function geek() {
    let str1 = "Geeksforgeeks is the computer "
        + "science portal for geeks.";
    let regex4 = /geek/gi;
    let match4 = str1.match(regex4);

    console.log("Found " + match4.length
        + " matches: " + match4);
}
geek();

Output

Found 3 matches: Geek,geek,geek

Example 2: This example matches the word “geeks” or “Geeks” (case insensitive) and replaces it with “GEEKS”. 

Javascript

function geek() {
    let str1 = "GEEKsforgeeks is the computer "
        + "science portal for geeks.";
    let regex4 = new RegExp("geeks", "ig");
    let replace = "GEEKS";
    let match4 = str1.replace(regex4, replace);
    console.log(" New string: " + match4);
}
geek();

Output

 New string: GEEKSforGEEKS is the computer science portal for GEEKS.

Supported Browsers: The browsers supported by RegExp i Modifier are listed below.

• Google Chrome
• Apple Safari
• Mozilla Firefox
• Opera
• Internet Explorer

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.