import re  # for matching

class Student(models.Model):
    _name = "student"

    name = fields.Char(string='Name', required=True)

    nid = fields.Char(string='NID', required=True)

    @api.constrains('name')
    def check_name(self):
        """ make sure name 10-15 alphabets and spaces"""
        for rec in self:
            # here i forced that the name should start with alphabets if it's not the case remove ^[a-zA-Z]
            # and just keep:  re.match(r"[ a-zA-Z]+", rec.name)
            if not 10 <= len(rec.name) <= 15 or not re.match(r"^[a-zA-Z][ a-zA-Z]*", rec.name):
                raise exceptions.ValidationError(_('your message about 10-15 alphabets and spaces'))

    @api.constrains('nid')
    def check_nid(self):
        """ make sure nid starts with capital letter, followed by 12 numbers and ends with a capital letter"""
        for rec in self:
            if not re.match(r"^[A-Z][0-9]{12}[A-Z]$", rec.nid):
                raise exceptions.ValidationError(_('your message about capital letter, followed'
                                                   'by 12 numbers and ends with a capital letter')