Hi,

You can do the validation according to the below code:

import re
from odoo.exceptions import ValidationError

@api.model
def create(self, vals):
    if vals.get('email'):
        match = re.match('^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$', vals.get('email'))
        if match == None:
            raise ValidationError('Not a valid E-mail ID')

    if vals.get('number'):
        match = re.match('\\+{0,1}[0-9]{10,12}', vals.get('number'))
        if match == None:
            raise ValidationError('Invalid Phone Number')
    return super(MultiContacts, self).create(vals)

Regards