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JavaScript | RegExp test() Method

  • Last Updated : 12 Apr, 2021

The RegExp test() Method in JavaScript is used to test for match in a string. If there is a match this method returns true else it returns false.
Syntax: 
 

RegExpObject.test(str)

Where str is the string to be searched. This is required field.
Example 1: This example searches for the string “computer” in the original string. 
 

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html




<!DOCTYPE html>
<html>
 
<head>
    <title>
        JavaScript RegExp test() Method
    </title>
</head>
 
<body style="text-align:center">
     
    <h1 style="color:green">
        GeeksforGeeks
    </h1>
     
    <h2>test() Method</h2>
     
     
<p>
        String: GeeksforGeeks is the
        computer science portal for geeks.
    </p>
 
     
    <button onclick="geek()">
        Click it!
    </button>
     
    <p id="app"></p>
 
     
    <script>
        function geek() {
            var str="GeeksforGeeks is the computer science"
                   + " portal for geeks.";
            var regex = new RegExp("computer", );
            var rex = regex.test(str);
             
            document.getElementById("app").innerHTML
                    = " Match " + " found: " + "<b>"
                    + rex + "</b>";
        }
    </script>
</body>
 
</html>                   

Output: 
Before clicking the button: 
 



After clicking the button: 
 

Example 2: This example searches for the string “GEEK” in the original string. 
 

html




<!DOCTYPE html>
<html>
 
<head>
    <title>
        JavaScript RegExp test() Method
    </title>
</head>
 
<body style="text-align:center">
     
    <h1 style="color:green">
        GeeksforGeeks
    </h1>
     
    <h2>test() Method</h2>
     
     
<p>
        String: GeeksforGeeks is the
        computer science portal for geeks.
    </p>
 
     
    <button onclick="geek()">
        Click it!
    </button>
     
    <p id="app"></p>
 
     
    <script>
        function geek() {
            var str="GeeksforGeeks is the computer science"
                    + " portal for geeks.";
            var regex = new RegExp("GEEK", );
            var rex = regex.test(str);
             
            document.getElementById("app").innerHTML
                    = " Match " + " found: "
                    + "<b>" + rex + "</b>";
        }
    </script>
</body>
 
</html>                   

Output: 
Before clicking the button: 
 

After clicking the button: 
 

Supported Browsers: The browsers supported by RegExp test() Method are listed below: 
 

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

 




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