JavaScript RegExp \0 Metacharacter

The RegExp \0 Metacharacter in JavaScript is used to find the NULL character. If it is found it returns the position else it returns -1.
Syntax: 

/\0/ 

or

new RegExp("\\0")

Example 1: This example searches for the Null character in the string.  

html

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

<h2>RegExp \0 Metacharacter</h2>

<p>Input String: GeeksforGeeks@_123_$</p>

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

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

<script>
    function geek() {
        var str1 = "GeeksforGeeks@_123_$";
        var regex4 = /\0/;
        var match4 = str1.search(regex4);
        if(match4 == -1) {
            document.getElementById("app").innerHTML
                = "No Null characters present. ";
        }
        else {
            document.getElementById("app").innerHTML
                = "Index of Null character: " + match4;
        }
    }
</script>

Output:

JavaScript RegExp \0 Metacharacter

Example 2: This example searches the position of the NULL character in the string. 

html

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

<h2>RegExp \0 Metacharacter</h2>

<p>String: 123ge\0eky456</p>

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

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

<script>
    function geek() {
        var str1 = "123ge\0eky456";
        var regex4 = new RegExp("\\0");
        var match4 = str1.search(regex4);
        document.getElementById("app").innerHTML =
            " Index of NULL character: " + match4;
    }
</script>

Output:

JavaScript RegExp \0 Metacharacter

Supported Browsers: The browsers supported by RegExp \0 Metacharacter 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.