def check_email(email):
if not re.match(r"<STR_LIT>", email):<EOL><INDENT>raise ValueError('<STR_LIT>')<EOL><DEDENT>return<EOL>
Function that verifies that the string passed is a valid email address.

Regex for email validation based on MailChimp limits:
http://kb.mailchimp.com/accounts/management/international-characters-in-mailchimp

:param email: The potential email address
:type email: :py:class:`str`
:return: Nothing