# This expression matches content that is within "balanced" punctuation.
# It does not validate that each type of open/close punctuation is valid.
# Just that it any open punctuation is matched by closed punctuation.
 
\p{Ps}   # The open punctuation
(?>
    [^\p{Ps}\p{Pe}]+| # Anything that is neither open or closed punctuation
    \p{Ps}(?<Depth>)| # If it's open punctuation, increment depth
    \p{Pe}(?<-Depth>) # If it's closed punctuation, decrement depth
)*(?(Depth)(?!))      # Match until depth is empty
\p{Pe}   # The closing punctuation
