Fix regular expression check for "OK". The regex had a bad format: not sure how it could have worked for anyone.

data.json

@@ -725,7 +725,7 @@
     "errorType": "message",
     "errorMsg": "This page does not exist on OK",
     "rank": 1,
-    "regexCheck": "^[a-zA-Z][a-zA-Z0-9_-.]*$",
+    "regexCheck": "^[a-zA-Z][a-zA-Z0-9_.-]*$",
     "url": "https://ok.ru/{}",
     "urlMain": "https://ok.ru/",
     "username_claimed": "ok",