Here是:
NODE EXPLANATION
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( group and capture to \1:
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[A-PR-UWYZ0-9] any character of: 'A' to 'P', 'R' to
'U', 'W', 'Y', 'Z', '0' to '9'
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[A-HK-Y0-9] any character of: 'A' to 'H', 'K' to
'Y', '0' to '9'
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[AEHMNPRTVXY0-9]? any character of: 'A', 'E', 'H', 'M',
'N', 'P', 'R', 'T', 'V', 'X', 'Y', '0'
to '9' (optional (matching the most
amount possible))
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[ABEHMNPRVWXY0-9]? any character of: 'A', 'B', 'E', 'H',
'M', 'N', 'P', 'R', 'V', 'W', 'X', 'Y',
'0' to '9' (optional (matching the most
amount possible))
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{1,2} ' ' (between 1 and 2 times (matching the
most amount possible))
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[0-9] any character of: '0' to '9'
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[ABD-HJLN-UW-Z]{2} any character of: 'A', 'B', 'D' to 'H',
'J', 'L', 'N' to 'U', 'W' to 'Z' (2
times)
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| OR
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GIR 0AA 'GIR 0AA'
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) end of \1