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JavaScript | RegExp * Quantifier

  • Last Updated : 22 Nov, 2019

The RegExp m* Quantifier in JavaScript is used to find the match of any string that contains zero or more occurrences of m.

Syntax:

/m*/ 

or

new RegExp("m*")

Syntax with modifiers:

/\m*/g 

or



new RegExp("m*", "g")

Example 1: This example matches the zero or more occurrences of the word ‘e’ in the whole string.




<!DOCTYPE html>
<html>
  
<head>
    <title>
        JavaScript RegExp * Quantifier
    </title>
</head>
  
<body style="text-align:center">
      
    <h1 style="color:green">
        GeeksforGeeks
    </h1>
      
    <h2>RegExp * Quantifier</h2>
      
    <p>Input String: GeeksforGeeks@_123_G$</p>
      
    <button onclick="geek()">
        Click it!
    </button>
      
    <p id="app"></p>
      
    <script>
        function geek() {
            var str1 = "GeeksforGeeks@_123_G$";
            var regex4 = /Ge*/gi;
            var match4 = str1.match(regex4);
  
            document.getElementById("app").innerHTML
                    = "Found " + match4.length
                    + " matches: " + match4;
        }
    </script>
</body>
  
</html>                    

Output:
Before Clicking the button:
into
After Clicking the button:
into

Example 2: This example replaces the occurrence of 128* with word “Geeky”.




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

Output:
Before Clicking the button:
into
After Clicking the button:
into

Supported Browsers: The browsers supported by RegExp * Quantifier are listed below:

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



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