JavaScript | RegExp \xdd Metacharacter

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The RegExp \xdd Metacharacter in JavaScript is used to find the character specified by a hexadecimal number dd. If the match is found it returns the character else it returns NULL.

Syntax:

/\xdd/

new RegExp("\\xdd")

Syntax with modifiers:

/\xdd/g

new RegExp("\\xdd", "g")

Example 1: This example matches the word corresponding to hexadecimal number 47 i.e G in the whole string.

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        JavaScript RegExp \xdd Metacharacter 
    </title> 
</head> 
  
<body style="text-align:center"> 
      
    <h1 style="color:green"> 
        zambiatek 
    </h1> 
      
    <h2>RegExp \xdd Metacharacter</h2> 
      
    <p>Input String: zambiatek@_123_$</p> 
      
    <button onclick="geek()"> 
        Click it! 
    </button> 
      
    <p id="app"></p> 
      
    <script> 
        function geek() { 
            var str1 = "zambiatek@_123_$"; 
            var regex4 = /\x47/gi; 
            var match4 = str1.match(regex4); 
  
            document.getElementById("app").innerHTML 
                    = "Found " + match4.length 
                    + " match: " + match4; 
        } 
    </script> 
</body> 
  
</html>                     

Output:
Before Clicking the button:
hexax
After Clicking the button:
hexax

Example 2: This example matches the hexadecimal number (67) which corresponds to “g” and replaces it with “G”.

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        JavaScript RegExp \xdd Metacharacter 
    </title> 
</head> 
  
<body style="text-align:center"> 
      
    <h1 style="color:green"> 
        zambiatek 
    </h1> 
      
    <h2>RegExp \xdd Metacharacter</h2> 
      
    <p>String: geeky@128</p> 
      
    <button onclick="geek()"> 
        Click it! 
    </button> 
      
    <p id="app"></p> 
      
    <script> 
        function geek() { 
            var str1 = "geeky@128"; 
            var regex4 = new RegExp("\\x67", "gi");          
            var replace = "G"; 
            var match4 = str1.replace(regex4, replace); 
            document.getElementById("app").innerHTML =  
                    " New string: " + match4; 
        } 
    </script> 
</body> 
  
</html>                     

Output:
Before Clicking the button:
hexax
After Clicking the button:
hexax

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

Google Chrome
Apple Safari
Mozilla Firefox
Opera
Internet Explorer

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