Implement a regular expression in Python to validate an email address.

Here is an example of a regular expression in Python that can be used to validate an email address : \n ``` \n import re \n \n email _ regex = r ' ^ [ a - zA - Z 0 - 9 ._ % + - ]+ @ [ a - zA - Z 0 - 9 .- ] +\ .[ a - zA - Z ]{ 2 , }$ ' \n \n def validate _ email ( email ): \n if re . match ( email _ regex , email ): \n return True \n else : \n return False \n ``` \n This regular expression will match an email address that contains only letters , numbers , and certain special characters ( such as @ , . , and - ), and has a domain name that consists of letters and numbers , with a maximum length of 2 5 5 characters . \n \n You can use the ` validate _ email ` function to check if a given email address is valid : \n ``` \n email = " example @ domain . com " \n if validate _ email ( email ): \n print (" The email address is valid ") \n else : \n print (" The email address is not valid ") \n ``` \n This will print " The email address is valid " if the email address is valid , and " The email address is not valid " if it is not . </s>