Small change to domain RE (#76)

* Update domain.py

Removing [.] from in the regex and added a non capturing group for it.

* Update test_domain.py

Added the following test case `a......b.com` to invalid domains.

* `+` and not a `*`

* removed extra `,`

* Update test_domain.py

removed extra lines.

Author: Ni-Knight

tests/test_domain.py

@@ -23,6 +23,7 @@ def test_returns_true_on_valid_domain(value):
     'example.',
     '-example.com',
     'example',
+    'a......b.com'
 ])
 def test_returns_failed_validation_on_invalid_domain(value):
     assert isinstance(domain(value), ValidationFailure)

validators/domain.py

@@ -3,9 +3,9 @@
 from .utils import validator
 
 pattern = re.compile(
-    r'^(([a-zA-Z]{1})|([a-zA-Z]{1}[a-zA-Z]{1})|'  # domain pt.1
+    r'^(:?(([a-zA-Z]{1})|([a-zA-Z]{1}[a-zA-Z]{1})|'  # domain pt.1
     r'([a-zA-Z]{1}[0-9]{1})|([0-9]{1}[a-zA-Z]{1})|'  # domain pt.2
-    r'([a-zA-Z0-9][-_.a-zA-Z0-9]{0,61}[a-zA-Z0-9]))\.'  # domain pt.3
+    r'([a-zA-Z0-9][-_a-zA-Z0-9]{0,61}[a-zA-Z0-9]))\.)+'  # domain pt.3
     r'([a-zA-Z]{2,13}|(xn--[a-zA-Z0-9]{2,30}))$'  # TLD
 )