So this is only visible in certain color schemes, but it’s a bit annoying.
Simply paste the following into a new file and set the syntax to Ruby:
class MyClass
REGEX = /\A[[:space:]]\z/
end
You will notice the first square bracket and the third are colored the same, and the second and forth are likewise. However, the first/fourth and second/third should be matching instead.
If you are on a color scheme where all of the square brackets look alike, try “Sixteen” (the built-in color scheme on which this is most obvious.
A screenshot is attached. This occurs on the latest version of ST3 on both Windows and Linux.