JavaScript RegExp ^ Quantifier

The RegExp ^m Quantifier in JavaScript is used to find the match of any string which contains m at the beginning of it. 

Syntax: 

/^m/ 

or

new RegExp("^m")

Syntax with modifiers:

/\^m/g 

or

new RegExp("^m", "g")

Example 1: This example matches the presence of word ‘Geeks’ at the beginning of the string. 

Javascript

function geek() {
    let str1 = "Geeksfor123\nGeeks@";
    let regex4 = /^Geeks/gim;
    let match4 = str1.match(regex4);

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

Output

Found 2 matches: Geeks,Geeks

Example 2: This example replaces the character ‘@’ with ‘#’. 

Javascript

function geek() {
    let str1 = "@128Geek";
    let regex4 = new RegExp("^@", "gi");
    let replace = "#";
    let match4 = str1.replace(regex4, replace);
    console.log(" New string: " + match4);
}
geek();

Output

 New string: #128Geek

Supported Browsers: The browsers supported by RegExp ^ Quantifier are listed below:

• Google Chrome
• Apple Safari
• Mozilla Firefox
• Opera
• Edge

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.