Hi all,

i'm testing some validation functions for the phone field to avoid others characters than numbers from 0 to 9.

    def valide_tel(self, cr, uid, ids, context=None):

        record = self.browse(cr, uid, ids)

        pattern = "^\+?[0-9]*$"

        for data in record:

            if re.match(pattern, data.phone) == None:

                return False

        return True

I tested the regex on pythex.org with success, but the problem is that when no phone number is entered, Odoo complains about ValidationError: expected string or buffer.

What can i do to have this working?

Thanks