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Matches a 'starting hand' header line from a PokerNow.club CSV hand history export, capturing the hand number, alphanumeric hand ID, game type, dealer (button) player name, UTC timestamp, and hand sequence number via named capture groups. Commonly used in Python scripts to parse poker session logs for tracking, analysis, or statistics. Requires the global (g) and multiline (m) flags to match each hand header across a multi-line CSV file.