diff --git a/sherlock/resources/data.json b/sherlock/resources/data.json
index 8f4345f9..f460b53c 100644
--- a/sherlock/resources/data.json
+++ b/sherlock/resources/data.json
@@ -50,6 +50,7 @@
     "errorMsg": "Oops! This page doesn\u2019t exist.",
     "errorType": "message",
     "rank": 3453,
+    "regexCheck":"^[a-z0-9_]$",
     "url": "https://500px.com/{}",
     "urlMain": "https://500px.com/",
     "username_claimed": "blue",