I need a string.gsub pattern / function that grabs the encompassing bracket of the sigma function
e.g.
rS(Σ(1, 2, 3))
returns
Σ(1, 2, 3)
I already have a pattern that does this: Σ%((.*)%)
But for nested brackets it fails, returning:
1, 2 ,3)
It also needs to involve brackets inside the sigma function, like this:
rS(Σ(1, 2, sin(4)))
Gets converted into
Σ(1, 2, sin(4))
This can either be a string.gsub pattern or a function that takes the string and returns the converted one
Thanks