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JavaScript | RegExp toString() Method

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  • Last Updated : 30 Sep, 2021
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The RegExp toString() Method in JavaScript is used to return the string value of the regular expression.
Syntax: 
 

RegExpObject.toString()

Example 1: This example returns the string value of the regular expression. 
 

html




<!DOCTYPE html>
<html>
 
<head>
    <title>
        JavaScript RegExp toString Method
    </title>
</head>
 
<body style="text-align:center">
     
    <h1 style="color:green">GeeksforGeeks</h1>
     
    <h2>RegExp toString() Method</h2>
     
     
<p>Input: RegExp([a-c]", "gi")</p>
 
     
    <button onclick="geek()">Click it!</button>
     
    <p id="app"></p>
 
     
    <script>
        function geek() {
            var regex = new RegExp("[a-c]", "gi");
            var rex = regex.toString();
            document.getElementById("app").innerHTML =
            "String Value: " + "<b>" + rex + "</b>";
        }
    </script>
</body>
 
</html>                   

Output: 
Before clicking the button: 
 

tostring

After clicking the button: 
 

tostring

Example 2: This example returns the string value of the regular expression. 
 

html




<!DOCTYPE html>
<html>
 
<head>
    <title>
        JavaScript RegExp toString Method
    </title>
</head>
 
<body style="text-align:center">
     
    <h1 style="color:green">GeeksforGeeks</h1>
     
    <h2>RegExp toString() Method</h2>
     
     
<p>Regular Expression: /[a-k]/g</p>
 
     
    <button onclick="geek()">Click it!</button>
     
    <p id="app"></p>
 
     
    <script>
        function geek() {
            var regex = /[a-k]/g;
            var rex = regex.toString();
            document.getElementById("app").innerHTML =
            "String Value: " + "<b>" + rex + "</b>";
        }
    </script>
</body>
 
</html>                   

Output: 
Before clicking the button: 
 

tostring

After clicking the button: 
 

tostring

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

  • Google Chrome 1 and above
  • Edge 12 and above
  • Firefox 1 and above
  • Internet Explorer 4 and above
  • Opera 5 and above
  • Safari 1 and above

 


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