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Regulatory law refers to law promulgated by an executive branch agency under a delegation from a legislature. Discussed at Regulation (law) and Primary and secondary legislation. Regulatory law contrasts to statutory law promulgated by the legislative branch, and common law or case law promulgated by the judicial branch.
The law that governs conduct of administrative agencies (both promulgation of regulations, and adjudication of applications or disputes), and judicial review of agency decisions, is called Administrative law. Administrative law is promulgated by the legislature (and refined by judicial common law) for governing agencies.
The administrative agencies are to create procedures, applications, licenses, appeals and one other important thing called decision making. Administrative Procedure Act is responsible for all the Federal agency policies. Some states have started following the policies through law or by regulation