Javascript

CPF
/^d{3}.d{3}.d{3}-d{2}$/


CNPJ
/^d{2}.d{3}.d{3}/d{4}-d{2}$/

both
/(^d{3}.d{3}.d{3}-d{2}$)|(^d{2}.d{3}.d{3}/d{4}-d{2}$)/

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