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JavaScript | RegExp \0 Metacharacter

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  • Last Updated : 14 Mar, 2022
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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




<!DOCTYPE html>
<html>
 
<head>
    <title>
        JavaScript RegExp \0 Metacharacter
    </title>
</head>
 
<body style="text-align:center">
     
    <h1 style="color:green">
        GeeksforGeeks
    </h1>
     
    <h2>RegExp &#092;&#048; 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 = /&#092;&#048;/;
            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>
</body>
 
</html>                   

Output: 
Before Clicking the button: 
 

bnul

After Clicking the button: 
 

bnul

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

html




<!DOCTYPE html>
<html>
 
<head>
    <title>
        JavaScript RegExp \0 Metacharacter
    </title>
</head>
 
<body style="text-align:center">
     
    <h1 style="color:green">
        GeeksforGeeks
    </h1>
     
    <h2>RegExp &#092;&#048; Metacharacter</h2>
     
    <p>String: 123ge&#092;&#048;eky456</p>
     
    <button onclick="geek()">
        Click it!
    </button>
     
    <p id="app"></p>
     
    <script>
        function geek() {
            var str1 = "123ge&#092;&#048;eky456";
            var regex4 = new RegExp("\&#092;&#048;");        
            var match4 = str1.search(regex4);
            document.getElementById("app").innerHTML =
                " Index of NULL character: " + match4;
        }
    </script>
</body>
 
</html>                   

Output: 
Before Clicking the button: 
 

bnul

After Clicking the button: 
 

bnul

Supported Browsers: The browsers supported by RegExp \0 Metacharacter are listed below: 
 

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

 


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