JavaScript | RegExp g Modifier

Last Updated : 22 Apr, 2019

The RegExp g Modifier in JavaScript is used to find all the occurrences of the pattern instead of stopping after the first match i.e it performs global match.

Syntax:

/regexp/g

new RegExp("regexp", "g")

Example 1: This example searches the word “geeks” in the whole string.

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        JavaScript RegExp g Modifier 
    </title> 
</head> 
  
<body style="text-align:center"> 
      
    <h1 style="color:green"> 
        GeeksforGeeks 
    </h1> 
      
    <h2>RegExp g Modifier</h2> 
      
    <p> 
        geeksforgeeks is the computer  
        science portal for geeks. 
    </p> 
      
    <button onclick="geek()"> 
        Click it! 
    </button> 
      
    <p id="app"></p> 
      
    <script> 
        function geek() { 
        var str1 = "geeksforgeeks is the computer " 
                 + "science portal for geeks."; 
        var regex4 = /geeks/g; 
        var match4 = str1.match(regex4); 
  
        document.getElementById("app").innerHTML =  
                    "Found " + match4.length 
                    + " matches: " + match4; 
        } 
    </script> 
</body> 
  
</html>                     

Output:
Before Clicking the button:

After Clicking the button:

Example 2: This example searches the word “portal” in the whole string and replaces it with “PORTAL”.

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        JavaScript RegExp g Modifier 
    </title> 
</head> 
  
<body style="text-align:center"> 
      
    <h1 style="color:green"> 
        GeeksforGeeks 
    </h1> 
      
    <h2>RegExp g Modifier</h2> 
      
    <p> 
        geeksforgeeks is the computer  
        science portal for geeks. 
    </p> 
      
    <button onclick="geek()"> 
        Click it! 
    </button> 
      
    <p id="app"></p> 
      
    <script> 
        function geek() { 
        var str1 = "geeksforgeeks is the computer " 
                 + "science portal for geeks."; 
        var regex4 = new RegExp("portal", "g");          
        var replace = "PORTAL"; 
        var match4 = str1.replace(regex4, replace); 
            document.getElementById("app").innerHTML =  
            " New string: " + match4; 
        } 
    </script> 
</body> 
  
</html>                     