how it works
This JavaScript code validates US phone numbers using event listeners for efficient user input handling. The ‘telephoneCheck’ function employs two regular expressions (‘rex1’ and ‘rex2’) to define valid US phone number patterns. Upon comparison, the function returns ‘true’ for a valid phone number and ‘false’ for an invalid one. The result is displayed on the webpage, showing “Valid!” in green for valid numbers and “Not Valid!” in red for invalid ones. This code offers a convenient and efficient means to verify adherence to standard US phone number formats.
Source Code here
