JavaScript Regular Expressions

JavascriptWeb DevelopmentObject Oriented Programming

Regular expressions are a string of characters describing a search pattern. This search pattern is then used to specify what we are searching in a text.

Following is the code for regular expressions in JavaScript −

Example

 Live Demo

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   }
   .sample,.result{
      font-size: 18px;
      font-weight: 500;
      color:red;
   }
</style>
</head>
<body>
<h1>JavaScript Regular Expressions</h1>
<div class="sample">The king bought the ring and went to the palace.</div>
<div style='color:black' class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>
Click on the above button to replace king with queen in the text above
</h3>
<script>
   let sampleEle = document.querySelector('.sample');
   let resultEle = document.querySelector('.result');
   document.querySelector('.Btn').addEventListener('click',()=>{
      let newText = sampleEle.innerHTML.replace(/king/gi,'queen');
      resultEle.innerHTML = 'Result = ' + newText;
   })
</script>
</body>
</html>

output

The above code will produce the following output -

On clicking the ‘CLICK HERE’ button −

raja
Published on 11-May-2020 18:05:17
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