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timestampPattern = regexp.MustCompile(`(?i)(\d{6,8})_(\d{6})\.wav$`)
// Allows optional suffixes between timestamp and extension (e.g., _16kHz) timestampPattern = regexp.MustCompile(`(?i)(\d{6,8})_(\d{6})(?:_[^/\\]*)?\.wav$`)
// Allows optional suffixes between timestamp and extension (e.g., _16kHz)
timestampPattern = regexp.MustCompile(`(?i)(\d{6,8})_(\d{6})(?:_[^/\\]*)?\.wav$`)