# Matches a PowerShell attribute declaration
\[
(?<AttributeName>[\w\.]+)
\s{0,}
\(              # An open parenthesis
(?<AttributeValue>
(?>                 # Followed by...
    [^\(\)]+|       # any number of non-parenthesis character OR
    \((?<Depth>)|   # an open parenthesis (in which case increment depth) OR
    \)(?<-Depth>)   # a closed parenthesis (in which case decrement depth)
)*(?(Depth)(?!))    # until depth is 0.
)
\)             # followed by a closing parenthesis
\]
