?repeats the group contents below at most once:
\sany whitespace character
\(the literal ( (4010 / 508 / 2816)
Group attune(?<attune>[^()]+?) Negated Character Class[^()]+? +?matches at least one character outside the set below:
(the literal ( (4010 / 508 / 2816)
)the literal ) (4110 / 518 / 2916)
\s*any whitespace character, repeated any number of times
Non-Capturing Group(?:by a\s+(?<class>[^()]*))? ?repeats the group contents below at most once:
by athe literal text by a (case sensitive) \s+any whitespace character, repeated at least once
Group class(?<class>[^()]*) Negated Character Class[^()]* *matches any number of characters outside the set below:
(the literal ( (4010 / 508 / 2816)
)the literal ) (4110 / 518 / 2916)
\)the literal ) (4110 / 518 / 2916)