Each of the three Regimes has a document we call the "Declaration" (and some people call a Constitution). The controlling text is the Spanish version; the English text is thought to be an accurate translation, but we cannot guarantee that. Also, you should not rely on "close textual analysis" to reach legal conclusions, as these Declarations pre-dated a major overhaul to BCS Condominium law which occurred in 2016.
That said, here are the Regime Declarations. They also appear in TownSq (/documents)
The Regime Declaration are really an intricate form of a DEED, transferrring the real estate comprising the condominium project into specific units, garages, common areas and in some cases commercial areas. That Declaration also has a section called "RULES AND REGULATIONS" that address some of the procedural and substantive terms of our "co-ownership." For example, it defines the Vigilance Committee and what is assigned to an "Administrator" and how budgets and dues are handled. It limits the uses of the units, garages and common areas, e.g., pet rules or not allowing commercial activity. In Canada and the USA, these "Rules and Regulations" are sometimes called "CC&Rs" or "by-laws."
We called the "Rules and Regulations" at the Regime level simply "Regulations," because they authorize the Administrator to issue "Rules" to implement some of the broad concepts contained in the Regulations. For example, the Regulations might limit the amount of noise to "reasonalbe" levels. The Rules can flesh that out by defining "quiet hours" or party permits or other things.
The Rules can implement, augment, define and extend the Regulations, but it cannot contradict them. If the Regulations say that unit owners are limited to two pets, the Rules cannot authorize three.