Law, tax and authorities
Reg.
Abbreviation for Regulation
In short and in plain language
Reg. is a short form for regulation. It is used when laws are cited.
A regulation of the European Union applies directly in the member states.
A directive is different. Each state first has to put it into its own law.
Definition
Reg. is a common abbreviation for regulation in legal citations. A European Union regulation applies directly in the member states, unlike a directive, which is first transposed into national law.