tld_extract extracts the top-level domain (TLD) from
a vector of domain names. This is distinct from the suffixes, extracted with
suffix_extract; TLDs are top level, while suffixes are just
domains through which internet users can publicly register domains (the difference
a vector of domains, retrieved through
a dataset of TLDs. If NULL (the default),
a data.frame of two columns:
domain, with the original domain names,
tld, the identified TLD from the domain.
suffix_extract for retrieving suffixes (distinct from TLDs).
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