This method checks whether a given email address is valid or not.
Think of this method as a bouncer at a club who checks if your ID is valid before letting you in. If your ID meets all the requirements (like having the correct format and domain), then you are considered a valid guest.
String: A sequence of characters that can be manipulated and stored in variables.
Regular Expression: A pattern used to match strings with specific formats, like email addresses.
Validation: The process of checking if data meets certain criteria or requirements.
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