localpartdomaintld
Localpartdomaintld is a descriptive shorthand used to refer to the three components that comprise a typical email address: the local part, the domain name, and the top-level domain (TLD). It is not a formal standard, but a convenient label found in documentation, teaching materials, and parsing schemas to emphasize how an address can be decomposed for processing.
The local part is the portion before the at-sign and designates a mailbox or user within a
In practice, software often parses an address into local and domain components, validates syntax, and then resolves