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. 

html

<h1 style="color:green">GeeksforGeeks</h1>

<h2>RegExp ^ Quantifier</h2>

<p>Input String: Geeksfor123\nGeeks@</p>

<button onclick="geek()">Click it!</button>

<p id="app"></p>

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

        document.getElementById("app").innerHTML
                = "Found " + match4.length
                + " matches: " + match4;
    }
</script>

Output:

JavaScript RegExp ^ Quantifier

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

html

<h1 style="color:green">GeeksforGeeks</h1>

<h2>RegExp ^ Quantifier</h2>

<p>String: @128Geek</p>

<button onclick="geek()">Click it!</button>

<p id="app"></p>

<script>
    function geek() {
    var str1 = "@128Geek";
        var regex4 = new RegExp("^@", "gi");
        var replace = "#";
        var match4 = str1.replace(regex4, replace);
        document.getElementById("app").innerHTML =
            " New string: " + match4;
    }
</script>

Output:

JavaScript RegExp ^ Quantifier

Supported Browsers: The browsers supported by RegExp ^ Quantifier 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.