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Source Regular Expression ^(?:\s*(Sun|Mon|Tue|Wed|Thu|Fri|Sat),\s*)?(0?[1-9]|[1-2][0-9]|3[01])\s+(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s+(19[0-9]{2}|[2-9][0-9]{3}|[0-9]{2})\s+(2[0-3]|[0-1][0-9]):([0-5][0-9])(?::(60|[0-5][0-9]))?\s+([-\+][0-9]{2}[0-5][0-9]|(?:UT|GMT|(?:E|C|M|P)(?:ST|DT)|[A-IK-Z]))(\s*\((\\\(|\\\)|(?<=[^\\])\((?<C>)|(?<=[^\\])\)(?<-C>)|[^\(\)]*)*(?(C)(?!))\))*\s*$
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