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(Sound\s*\{\s*Name\s=\s$Sound;\s*Priority\s=\s)([\d\D]*?); (Sound\s*\{(\s*)Name\s=\s$Sound;\s*$)
$1$Pri; $1$2Priority\ =\ $Pri;\n
s/(Sound\s*\{\s*Name\s=\s$Sound).*?;/$1; Priority = $Pri;/m