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JavaScript | RegExp [0-9] Expression

  • Last Updated : 22 Apr, 2019
Geek Week

The RegExp [0-9] Expression in JavaScript is used to search any digit which is between the brackets. The character inside the brackets can be a single digit or a span of digits.

Syntax:

/[0-9]/ 

or

new RegExp("[0-9]")

Syntax with modifiers:

/[0-9]/g 

or



new RegExp("[0-9]", "g")

Example 1: This example searches the digits between [0-4] in the whole string.




<!DOCTYPE html>
<html>
  
<head>
    <title>
        JavaScript RegExp [0-9] Expression
    </title>
</head>
  
<body style="text-align:center">
      
    <h1 style="color:green">
        GeeksforGeeks
    </h1>
      
    <h2>RegExp [0-9] Expression</h2>
      
    <p>Input String: 1234567890</p>
      
    <button onclick="geek()">
        Click it!
    </button>
      
    <p id="app"></p>
      
    <script>
        function geek() {
            var str1 = "123456790";
            var regex4 = /[0-4]/g;
            var match4 = str1.match(regex4);
  
            document.getElementById("app").innerHTML = 
                    "Found " + match4.length 
                    + " matches: " + match4;
        }
    </script>
</body>
  
</html>                    

Output:
Before Clicking the button:
digit
After Clicking the button:
digit

Example 2: This example searches the digits between [0-9] in the whole string and replaces the characters with hash(#).




<!DOCTYPE html>
<html>
  
<head>
    <title>
        JavaScript RegExp [0-9] Expression
    </title>
</head>
  
<body style="text-align:center">
      
    <h1 style="color:green">
        GeeksforGeeks
    </h1>
      
    <h2>RegExp [0-9] Expression</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("[0-9]", "g");
            var match4 = str1.replace(regex4, replacement);
  
            document.getElementById("app").innerHTML =
                " New string: " + match4;
        }
    </script>
</body>
  
</html>                    

Output:
Before Clicking the button:
digit
After Clicking the button:
digit

Supported Browsers: The browsers supported by RegExp [0-9] Expression are listed below:

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

Hey geek! The constant emerging technologies in the world of web development always keeps the excitement for this subject through the roof. But before you tackle the big projects, we suggest you start by learning the basics. Kickstart your web development journey by learning JS concepts with our JavaScript Course. Now at it’s lowest price ever!




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