Regex Editor & Tester

Validates email addresses based on RFC 5322 grammar, supporting both standard dot-separated local parts (alphanumerics plus symbols like !#$%&'*+/=?^_`{}|~) and quoted-string local parts containing escaped or control characters. The domain requires one or more labels of up to 63 characters that start and end with alphanumerics, followed by a 2-6 letter TLD and an optional trailing dot. Useful for input/schema validation, such as verifying email fields before storing documents in MongoDB via Python.