When menstruation occurs on a regular basis that is the norm, there is no special word to explain this. When you get your period on a regular basis it is simply known as a regular menstrual cycle, it's a positive and normal thing.

Why does a person have his blood pressure checked on a regular basis?

Land cruiser are designed to move on hard to reach by regular car terrains. Of course those can be used on regular basis.

Something a person does on a regular basis.

no