diff --git a/lib/PoorBooru/API/V0.pm b/lib/PoorBooru/API/V0.pm
index 337eeb9..a121a12 100644
--- a/lib/PoorBooru/API/V0.pm
+++ b/lib/PoorBooru/API/V0.pm
@@ -21,7 +21,8 @@ use constant {
 	ROWS_PER_PAGE        => 20,
 };
 
-my $TAG_NAME_RE = qr/^[0-9]*[A-Z_a-z][0-9A-Z_a-z]*$/;
+my $TAG_NAME_RE   = qr/^[0-9]*[A-Z_a-z][0-9A-Z_a-z]*$/;
+my $NUMERIC_ID_RE = qr/^[1-9][0-9]*$/;
 
 sub mkpager ($)
 {
@@ -87,7 +88,7 @@ get "/tag/:tag_id_or_name" => sub {
 
 get "/media" => sub {
 	my $page = query_parameters->get("page") // 1;
-	send_error("Invalid page number", 400) if $page !~ /^[1-9][0-9]*$/;
+	send_error("Invalid page number", 400) if $page !~ $NUMERIC_ID_RE;
 
 	my $paged_media = schema("default")->resultset("Media")
 	    ->search({}, { order_by => "upload_date", rows => ROWS_PER_PAGE })