"Regular quinoa" refers to the basic and standard variety of quinoa, a type of grain-like seed. It means the typical kind that is commonly available, without any special or unique features.
We have seen recipes on quinoa porridge both with flakes and regular quinoa grains, so which ever you choose I am sure you will succeed. (greenkitchenstories.com)
I used 1 cup of regular quinoa and 1/2 cup each red and black quinoa. (doubletherecipe.com)