diff --git a/testUpdateHostsFile.py b/testUpdateHostsFile.py
index 7b3ff3a49..33b820fe1 100644
--- a/testUpdateHostsFile.py
+++ b/testUpdateHostsFile.py
@@ -842,7 +842,7 @@ class TestNormalizeRule(BaseStdout):
             "128.0.0.1",
             "0.0.0 google",
             "0.1.2.3.4 foo/bar",
-            "0.0.0.0 https"
+            "0.0.0.0 https",
         ]:
             self.assertEqual(normalize_rule(rule, **kwargs), (None, None))
 
@@ -905,7 +905,7 @@ class TestNormalizeRule(BaseStdout):
             sys.stdout = StringIO()
 
     def test_no_comment_raw(self):
-        for rule in ("twitter.com", "google.com", "foo.bar.edu"):
+        for rule in ("twitter.com", "google.com", "foo.bar.edu", "www.example-foo.bar.edu"):
             expected = (rule, "0.0.0.0 " + rule + "\n")
 
             actual = normalize_rule(
diff --git a/updateHostsFile.py b/updateHostsFile.py
index 5c8271492..6a96878e9 100755
--- a/updateHostsFile.py
+++ b/updateHostsFile.py
@@ -1061,7 +1061,7 @@ def normalize_rule(rule, target_ip, keep_domain_comments):
     """
     first try: IP followed by domain
     """
-    regex = r"^\s*(\d{1,3}\.){3}\d{1,3}\s+([\w\.-]+[a-zA-Z])(.*)"
+    regex = r"^\s*(\d{1,3}\.){3}\d{1,3}\s+((?:\w+\.)+[a-zA-Z\.-]+)(.*)"
     result = re.search(regex, rule)
 
     if result:
@@ -1090,7 +1090,7 @@ def normalize_rule(rule, target_ip, keep_domain_comments):
     """
     # deny any potential IPv6 address here.
     if ":" not in rule:
-        regex = r"^\s*([\w\.-]+[a-zA-Z])(.*)"
+        regex = r"^\s*((?:\w+\.)+[a-zA-Z\.-]+)(.*)"
         result = re.search(regex, rule)
 
         if result: