Regex Tester & Validator

This regular expression matches standard email addresses by validating the local part, the '@' symbol, and the domain structure including a top-level domain (TLD) of 2 to 4 characters. It is commonly used for basic form validation to ensure user input resembles a valid email format. Note that it restricts the TLD length to 4 characters, which might incorrectly reject newer, longer TLDs like '.online' or '.design'.