This method invocation
works exactly as intended - it returns an array of matches
I don't need the brackets, so out of curiosity I tried this tweak
which - somewhat to my surprise I must admit - does exactly what I was hoping it would do and returns
(IOW the closing bracket is not included in the match).
Emboldened by that success I tried this further tweak
but was disappointed; that also returns
(IOW the opening bracket is still included in the match).
The asymmetry of the (? operators in this context appears to be a glitch; either that or the (?: doesn't do what I think it does.