Regex Tester & Validator

This regex enforces password complexity by requiring at least one uppercase letter, one lowercase letter, one digit, and one special character from the set #?!@$%^&*-_., while also ensuring a minimum length of 8 characters. It uses lookahead assertions to check each requirement independently without consuming characters, making it efficient for validation. Common use cases include sign-up forms, login systems, and any security policy requiring strong passwords.