diff --git a/dnstapir/key_resolver.py b/dnstapir/key_resolver.py
index 1a01896..2e94563 100644
--- a/dnstapir/key_resolver.py
+++ b/dnstapir/key_resolver.py
@@ -24,6 +24,8 @@
     description="The number of public key lookups",
 )
 
+KEY_ID_VALIDATOR = re.compile(r"^[a-zA-Z0-9_\-.]+$")
+
 
 def key_resolver_from_client_database(client_database: str, key_cache: KeyCache | None = None):
     if client_database.startswith("http://") or client_database.startswith("https://"):
@@ -35,7 +37,7 @@ def key_resolver_from_client_database(client_database: str, key_cache: KeyCache
 class KeyResolver:
     def __init__(self):
         self.logger = logging.getLogger(__name__).getChild(self.__class__.__name__)
-        self.key_id_validator = re.compile(r"^[a-zA-Z0-9_\-.]+$")
+        self.key_id_validator = KEY_ID_VALIDATOR
 
     @abstractmethod
     def resolve_public_key(self, key_id: str) -> PublicKey:
diff --git a/pyproject.toml b/pyproject.toml
index 4cc4885..279b4cc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "dnstapir"
-version = "1.2.2"
+version = "1.2.3"
 description = "DNS TAPIR Python Library"
 authors = ["Jakob Schlyter <jakob@kirei.se>"]
 readme = "README.md"