```
def validate_email(email_address):
""" Function to validate an email address.

This function will take an email address as an argument and
return True if the email address is valid or False if it is not.

:param email_address: The email address to validate.
:return: True if valid, False if invalid.
"""
    if re.match("^[\w\.\+\-]+\@[\w]+\.[a-z]{2,3}$", email_address):
        return True
    else:
        return False
```
Scrivi una funzione per convalidare un indirizzo email.