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JavaScript | RegExp . Metacharacter

  • Last Updated : 22 Apr, 2019

The RegExp . Metacharacter in JavaScript is used to search single character, except line terminator or newline.

Syntax:

/regexp./ 

or

new RegExp("regexp.")

Syntax with modifiers:

/regexp./g 

or



new RegExp("regexp.", "g")

Example 1: This example searches the words whose starting character is “A” and ending character is “C” with only one character in between them.




<!DOCTYPE html>
<html>
  
<head>
    <title>
        JavaScript RegExp . Metacharacter
    </title>
</head>
  
<body style="text-align:center">
      
    <h1 style="color:green">
        GeeksforGeeks
    </h1>
      
    <h2>RegExp . Metacharacter</h2>
      
    <p>
        Input String: ABC, A3C, A C, AXXCC!
    </p>
      
    <button onclick="geek()">
        Click it!
    </button>
      
    <p id="app"></p>
      
    <script>
        function geek() {
            var str1 = "ABC, A3C, A C, AXXCC!";
            var regex4 = /A.C/g;
            var match4 = str1.match(regex4);
  
            document.getElementById("app").innerHTML =
                        "Found " + match4.length
                        + " matches: " + match4;
        }
    </script>
</body>
  
</html>                    

Output:
Before Clicking the button:
dot
After Clicking the button:
dot

Example 2: This example searches the words having “a” as starting letter and “c” as ending the letter with only one character in between.




<!DOCTYPE html>
<html>
  
<head>
    <title>
        JavaScript RegExp . Metacharacter
    </title>
</head>
  
<body style="text-align:center">
      
    <h1 style="color:green">
        GeeksforGeeks
    </h1>
      
    <h2>RegExp . Metacharacter</h2>
      
    <p>
        Input String: ABC, A3X, a x, AXXCC!
    </p>
      
    <button onclick="geek()">
        Click it!
    </button>
      
    <p id="app"></p>
      
    <script>
        function geek() {
            var str1 = "ABC, A3X, a x, AXXCC!";         
            var regex4 = new RegExp("a.x", "g");
            var match4 = str1.match(regex4);
  
            document.getElementById("app").innerHTML =
                        "Found " + match4.length
                        + " matches: " + match4;
        }
    </script>
</body>
  
</html>                    

Output:
Before Clicking the button:
dot
After Clicking the button:
dot

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

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



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