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How to test and execute a regular expression in JavaScript?
Following is the code for testing and executing a regular expression in JavaScript −
Example
<!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; } .result,.sample { font-size: 20px; font-weight: 500; } </style> </head> <body> <h1>Testing and executing regular expressions</h1> <div class="sample"></div> <div style="color: green;" class="result"></div> <button class="Btn">CLICK HERE</button> <h3> Click on the above button to test and execute the regular expression </h3> <script> let sampleEle=document.querySelector('.sample'); let resEle = document.querySelector('.result'); let str = 'Hello world. This is a beautiful world'; sampleEle.innerHTML =str; let pattern = new RegExp("world"); document.querySelector(".Btn").addEventListener("click", () => { resEle.innerHTML += 'pattern.test(str) = ' + pattern.test(str) + '<br>'; resEle.innerHTML += 'pattern.exec(str) = ' + pattern.exec(str) + '<br>'; }); </script> </body> </html>
Output
The above code will produce the following output −
On clicking the ‘CLICK HERE’ button −
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