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valid_postcode_format
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Attempts to validate that the format of the given string matches a standard postcode format
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valid_postcode_format
FUNCTION valid_postcode_format(p_postcode IN VARCHAR2) RETURN BOOLEAN
Attempts to validate that the format of the given string matches a standard postcode format
This includes the general format of the string, plus any restrictions on character values within the overall format.
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p_string
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the string whose format is to be checked
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TRUE if the given string matches a known postcode format
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