import re
from .utils import validator
pattern = re.compile(
r'^(([a-zA-Z]{1})|([a-zA-Z]{1}[a-zA-Z]{1})|'
r'([a-zA-Z]{1}[0-9]{1})|([0-9]{1}[a-zA-Z]{1})|'
r'([a-zA-Z0-9][-_.a-zA-Z0-9]{0,61}[a-zA-Z0-9]))\.'
r'([a-zA-Z]{2,13}|[a-zA-Z0-9-]{2,30}.[a-zA-Z]{2,3})$'
)
@validator
[docs]def domain(value):
"""
Return whether or not given value is a valid domain.
If the value is valid domain name this function returns ``True``, otherwise
:class:`~validators.utils.ValidationFailure`.
Examples::
>>> domain('example.com')
True
>>> domain('example.com/')
ValidationFailure(func=domain, ...)
Supports IDN domains as well::
>>> domain('xn----gtbspbbmkef.xn--p1ai')
True
.. versionadded:: 0.9
.. versionchanged:: 0.10
Added support for internationalized domain name (IDN) validation.
:param value: domain string to validate
"""
return pattern.match(value)