Validate & Check Email Addresses Online Validate email addresses against RFC 5322 format rules with detailed error explanations.

Under the hood, the Email Validator tool uses a combination of algorithms and data structures to validate email addresses. The `validateEmail` function takes an input string, trims it, and checks if it contains exactly one @ symbol. It then splits the string into local and domain parts using the `split` method. The local part is checked for empty strings, excessive length (more than 64 characters), and invalid formatting such as starting or ending with a dot, or containing consecutive dots. The domain is also validated by checking its length (not more than 253 characters) and ensuring it contains at least one dot, separating the domain name from the top-level domain (TLD). The TLD itself must be at least two characters long.

The tool uses regular expressions to check if the email address conforms to the RFC 5322 format. Specifically, it employs the `emailRegex` pattern to test for valid characters in the local part and domain. If any checks fail, it returns an object with a `valid` property set to false and an array of error messages detailing what went wrong. For common domains like 'gmail.com' or 'yahoo.com', it uses the levenshtein function to suggest corrections when typos are detected, calculating the edit distance between the input domain and known domains. The `levenshtein` function implements dynamic programming to efficiently compute this distance.

The Email Validator component itself is built using React, with state managed by `useState` and event handling facilitated by `useCallback`. It renders an input field for users to enter their email address, along with a button to trigger validation. Upon validation, it displays the result, including whether the email is valid or not, the email address itself, and detailed feedback on any errors found. The component utilizes Framer Motion for animations and reacts to user interactions such as keyboard input and button clicks.