The product-range input parameter is a string of up to 10 characters, which may be as follows.
Either a single specific product-id in the database; or
A string which can represent one or more product-ids in the database, by using wildcard characters. These are the characters _ (match single character) and/or % (match any characters):
each _ character is considered to be matched by any one, and exactly one, character in a product-id
each % character is considered to be matched by any group of zero or more characters in a product-id.
For example, a string of % alone would match all product-ids in the database, or a string of _ _ _ _ _ would match all product-ids exactly five characters long.
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