You've probably seen this before, if not a thousand times, but here's a simple function to check the format of a UK postcode.
PHP:
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function valid_uk_postcode($postcode)
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{
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return (preg_match('/^([A-PR-UWYZ][A-HK-Y0-9][AEHMNPRTVXY0-9]?[ABEHMNPRVWXY0-9]? {0,2}[0-9][ABD-HJLN-UW-Z]{2}|GIR 0AA)$/i', $postcode)) ?
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true : false;
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}
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