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EAN-13 add letters in combinations


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If it is a normal product, I have modified the Validate.php file and edited leaving it like this
return! $ ean13 || preg_match ('/ ^ [a-zA-Z0-9] {0.13} $ /', $ ean13);
and works.


But when it is a product with combinations I cannot add this EAN with Letters


I need help to validate this and that allows me to add EAN with letters in the combinations.

Thank you

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