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Explain JavaScript Regular Expression modifiers with examples
The JavaScript regular expression modifiers are optional part of a regular expression and allow us to perform case insensitive and global searchers. The modifiers can also be combined together.
Following are the modifiers −
| Modifier | Description |
|---|---|
| g | It enables global matching and returns all the matched results instead of stopping at first match |
| i | It enables case insensitive matching |
| m | It enables multiline matching |
Example
Following is the code for strict comparison in JavaScript switch statement −
<!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 { font-size: 20px; font-weight: 500; } </style> </head> <body> <h1>JavaScript Regular expression modifiers</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 see the modifiers operate on the above string </h3> <script> let sampleEle=document.querySelector('.sample'); let resEle = document.querySelector('.result'); let str = '
Hello world. This is a beautiful world'; sampleEle.innerHTML =str; document.querySelector(".Btn").addEventListener("click", () => { resEle.innerHTML += '/^Hello/m = ' + str.match(/^Hello/m) + '<br>'; resEle.innerHTML += '/world/g = ' + str.match(/world/g) + '<br>'; resEle.innerHTML += '/WORLD/i = ' + str.match(/WORLD/i) + '<br>'; }); </script> </body> </html> Output
The above code will produce the following output −
On clicking the ‘CLICK HERE’ button −
Updated on: 2020-07-15T14:05:54+05:30
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