diff --git a/utils/generate-domains-blacklists/generate-domains-blacklist.py b/utils/generate-domains-blacklists/generate-domains-blacklist.py
index 466c5372..43eba48b 100755
--- a/utils/generate-domains-blacklists/generate-domains-blacklist.py
+++ b/utils/generate-domains-blacklists/generate-domains-blacklist.py
@@ -52,14 +52,14 @@ def parse_list(content, trusted=False):
     rx_comment = re.compile(r"^(#|$)")
     rx_inline_comment = re.compile(r"\s*#\s*[a-z0-9-].*$")
     rx_u = re.compile(
-        r"^@*\|\|([a-z0-9.-]+[.][a-z]{2,})\^?(\$(popup|third-party))?$")
-    rx_l = re.compile(r"^([a-z0-9.-]+[.][a-z]{2,})$")
+        r"^@*\|\|([a-z0-9][a-z0-9.-]*[.][a-z]{2,})\^?(\$(popup|third-party))?$")
+    rx_l = re.compile(r"^([a-z0-9][a-z0-9.-]*[.][a-z]{2,})$")
     rx_h = re.compile(
-        r"^[0-9]{1,3}[.][0-9]{1,3}[.][0-9]{1,3}[.][0-9]{1,3}\s+([a-z0-9.-]+[.][a-z]{2,})$"
+        r"^[0-9]{1,3}[.][0-9]{1,3}[.][0-9]{1,3}[.][0-9]{1,3}\s+([a-z0-9][a-z0-9.-]*[.][a-z]{2,})$"
     )
-    rx_mdl = re.compile(r'^"[^"]+","([a-z0-9.-]+[.][a-z]{2,})",')
-    rx_b = re.compile(r"^([a-z0-9.-]+[.][a-z]{2,}),.+,[0-9: /-]+,")
-    rx_dq = re.compile(r"^address=/([a-z0-9.-]+[.][a-z]{2,})/.")
+    rx_mdl = re.compile(r'^"[^"]+","([a-z0-9][a-z0-9.-]*[.][a-z]{2,})",')
+    rx_b = re.compile(r"^([a-z0-9][a-z0-9.-]*[.][a-z]{2,}),.+,[0-9: /-]+,")
+    rx_dq = re.compile(r"^address=/([a-z0-9][a-z0-9.-]*[.][a-z]{2,})/.")
 
     if trusted:
         return parse_trusted_list(content)