The relation "Have a gravitational pull towards each other" has always been in effect, even before we detected it. Every physical law has always existed even before we detected it, and every physical law fits the definition of a pattern (which is why we can represent it mathematically). — khaled
Patterns and relations exist in the mind of an observer of a mind-independent world
The Moon circled the Earth before humans existed, and in our terms, there was a pattern in how the Moon circled the Earth and there was a relation between the Moon and the Earth.
A pattern needs a relation between parts. I agree that patterns and relations exist in the mind, but do patterns and relations exist in a mind-independent world, because it affects your thesis that " I believe that what exists is matter, and patterns of matter".
Force is a different concept to relation, in that there may be a temporal relation between two masses yet no force between them. Two masses on either side of the Universe will have a spatial relation yet there be no force between them. There may be a relation between a mass and my concept of the mass yet no force between them. Force should be treated differently to relation.
My belief is that patterns and relations don't exist in a mind-independent world, for the reason that there is nowhere for them to exist.
Consider a system of two masses each experiencing a force as described by the equation F = Gm1m2/r2, the equation of universal gravitation. Mass m1 moves because of a force due to m2, and in our terms there is a relation between m1 and m2 and there is a pattern in the movement of m1 expressed by the equation.
Consider mass m1 experiencing a force. An external observer may know that the force on m1 is due to mass m2 at distance r, yet no observer could discover from an internal inspection of m1 that the force it was experiencing was due to m2 at distance r. Problem one is that the force from a 1kg mass at 1m would be the same force as a 4kg mass at 2m, giving an infinite number of possibilities. Problem two is that mass m1 can only exist at one moment in time, meaning that no information could be discovered within it as to any temporal or spatial change it may or may not have experienced.
Similarly, no internal inspection of m2 could discover any relation with m1. Similarly, no internal inspection of the force on m1 could discover any relation with mass m2, and no internal inspection of the force on m2 could discover any relation with mass m1. No observation internal to the m1, m2 system could discover any relation between m1, m2 and the force between them. Relations cannot be discovered intrinsic to the system m1, m2 because relations don't exist intrinsic to the system m1, m2.
An outside observer of the system m1, m2 may discover the relation F = Gm1m2/r2 because the relation is extrinsic to the system m1,m2. An extrinsic observer of the system m1, m2 would be able to relate the movement of m1, m2 to a force between them determined by the equations F = Gm1m2/r2 and F = ma. The observer would be aware of a relation between m1, m2, and being aware of a relation would be aware of a pattern.
As the relation F = Gm1m2/r2 is not intrinsic to the system m1, m2, by implication, the laws of nature are not intrinsic in a mind-independent world. Similarly, as the relation F = Gm1m2/r2 may be discovered by an outside observer of the system m1, m2, by implication, the laws of nature being extrinsic to a mind-independent world exist in the mind of an observer.
In summary, relations and patterns are extrinsic to a mind-independent world, and exist in the mind of someone observing a mind-independent world.