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This regular expression matches German license plates (KFZ Kennzeichen) without hyphens, using spaces as separators instead. It validates the standard format consisting of a one to three letter city code, followed by one or two middle letters, and ending with a number between 10 and 9999. This pattern is useful for validating vehicle registration inputs in applications targeting the German market. It supports standard German umlauts (Ä, Ö, Ü).