JavaScript | RegExp w Metacharacter

The RegExp \w Metacharacter in JavaScript is used to find the word character i.e. characters from a to z, A to Z, 0 to 9. It is same as [a-zA-Z_0-9].

Syntax:

/\w/

new RegExp("\\w")

Syntax with modifiers:

/\w/g

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

Example 1: This example searches the lowercase characters, uppercase characters and underscore.

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        JavaScript RegExp \w Metacharacter 
    </title> 
</head> 
  
<body style="text-align:center"> 
      
    <h1 style="color:green"> 
        GeeksforGeeks 
    </h1> 
      
    <h2>RegExp \w 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 = /\w/g; 
            var match4 = str1.match(regex4); 
  
            document.getElementById("app").innerHTML =  
                        "Found " + match4.length 
                        + " matches: " + match4; 
        } 
    </script> 
</body> 
  
</html>                     

Output:
Before Clicking the button:
backw
After Clicking the button:
backw

Example 2: This example searches the lowercase characters, uppercase characters and underscores and replaces them with hash(#).

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        JavaScript RegExp \w Metacharacter 
    </title> 
</head> 
  
<body style="text-align:center"> 
      
    <h1 style="color:green"> 
        GeeksforGeeks 
    </h1> 
      
    <h2>RegExp \w Metacharacter</h2> 
      
    <p>Input String: 128@$%</p> 
      
    <button onclick="geek()"> 
        Click it! 
    </button> 
      
    <p id="app"></p> 
      
    <script> 
        function geek() { 
            var str1 = "128@$%";          
            var replacement = "#"; 
            var regex4 = new RegExp("\\w", "g"); 
            var match4 = str1.replace(regex4, replacement); 
  
            document.getElementById("app").innerHTML = 
                    "Found " + match4.length 
                    + " matches: " + match4; 
        } 
    </script> 
</body> 
  
</html>                     

Output:
Before Clicking the button:
backw
After Clicking the button:
backw

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

Google Chrome
Apple Safari
Mozilla Firefox
Opera
Internet Explorer

My Personal Notes

JavaScript | RegExp \w Metacharacter

Recommended Posts: