hello odoo family 
i want to validate an valid email i know how to do it from python code but i want to do this using xml. below is my xml field

name="email"
widget="regex_mask" data-inputmask-regex='[a-zA-Z0-9._%-]+@[a-zA-Z0-9-]+\.[a-zA-Z]{2,4}'
context="{'gravatar_image': True}"

 but this thing is not working on email
i have also use widget="regex_mask"  data-inputmask-regex="^\d+$" on char filed and this is working fine

it would not take any character from keyboard 
i any one know how to do this ... please let me know i'm waiting for your answer :)