Custom field to store EAN Code

-- HikaShop version -- : 2.6
-- Joomla version -- : 3.45

I need to store an EAN code and I don't see a default field for this so I will go to creat a custom field.

Would be ideal that only numbers could be stored and avoid a "by accident" introduction of letters.

Can I achieve this with custom field?

If so, could you help me with the regular expression?

Thank you.

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UPDATE

Another question related to the same topic. When I create a customtext custom field there is no way the column name assumes the name I give and it gives a random name with this pattern

customtext_334_12_30_26

I tried several names without success

ean_code
ean_number
ean_code_number

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Then when I make an import form a CSV I get this message for this field:

The column 'customtext_334_12_29_26' is not in the list of possible columns : (although it is clearly present in the custom field list)

Thank you.

Maybe my explanation about point #2 was not very good. I will do different.

You say that custom text does not create any column, well, indeed it does as it is a custom field. Let me show white I write and what I get after saving the custom field.

Read the data in the third form field named Column name.

When creating the custom field with Field type customtext

After saving it


Then when importing data form hikashop the system is not identifying none of the names, not mine not the one after saving.

Regards,

UPDATE:

And this what I see in custom field list view

Wow!

It took me a while to figure your explanation. Finally I understand that is serves the purpose of showing an informative text when some view displays the custom fields autmoatically one after the other, so the purpose of custom text is its label to be displayed before or after a set of custom fields.

Is this the concept? I was not good to find in the documentation but I found several posts getting the same confusion as me.

What is harder for me to understand is what are the regex for. I was convinced that was a way to build an input mask so that is why I was so interested in this field type.

Regards