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JavaScript | RegExp [abc] Expression

  • Last Updated : 18 Apr, 2019

The RegExp [abc] Expression in JavaScript is used to search any character between the brackets. The character inside the brackets can be a single character or a span of characters.

  • [A-Z]: It is used to match any character from uppercase A to Z.
  • [a-z]: It is used to match any character from lowercase a to z.
  • [A-z]: It is used to match any character from uppercase A to lowercase z.
  • [abc…]: It is used to match any character between the brackets.

Syntax:

/[abc]/ 

or

new RegExp("[abc]")

Syntax with modifiers:

/\[abc]/g 

or



new RegExp("[abc]", "g")

Example 1: This example searches the characters between [A-G] i.e uppercase A to uppercase G in the whole string.




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

Output:

  • Before Clicking the button:
    abc
  • After Clicking the button:
    abc

Example 2: This example searches the characters between [a-g] i.e lowercase a to lowercase g in the whole string.




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

Output:

  • Before Clicking the button:
    abc
  • After Clicking the button:
    abc

Supported Browsers: The browsers supported by RegExp [abc] Expression are listed below:

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



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