JavaScript | exec() Method
The exec() Method in JavaScript is used to test for match in a string. If there is a match this method returns the first match else it returns NULL.
Syntax:
RegExpObject.exec(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.
html
<!DOCTYPE html><html><body style="text-align:center"> <h1 style="color:green"> GeeksforGeeks </h1> <h2>exec() 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", ); // match "computer" in string. var rex = regex.exec(str); document.getElementById("app").innerHTML = " Found " + rex.length + " match: " + rex; } </script></body></html> |
Output:
Before clicking the button:
After clicking the button:
Example-2: This example searches for the string “rep” in the original string.
html
<!DOCTYPE html><html><body style="text-align:center"> <h1 style="color:green"> GeeksforGeeks </h1> <h2> exec() 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("rep"); // Match "rep" in string. var rex = regex.exec(str); alert(rex); } </script></body></html> |
Output:
Before clicking the button:
After clicking the button:
Supported Browsers: The browsers supported by JavaScript exec() Method are listed below:
- Google Chrome
- Apple Safari
- Mozilla Firefox
- Opera
- Internet Explorer
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