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External Data Source

Source

Regular Expression
^(GIR ?0AA|(?:[A-PR-UWYZ](?:\d|\d{2}|[A-HK-Y]\d|[A-HK-Y]\d\d|\d[A-HJKSTUW]|[A-HK-Y]\d[ABEHMNPRV-Y])) ?\d[ABD-HJLNP-UW-Z]{2})$