diff --git a/sherlock/resources/data.json b/sherlock/resources/data.json
index fe206b62..ee3eff49 100644
--- a/sherlock/resources/data.json
+++ b/sherlock/resources/data.json
@@ -25,7 +25,7 @@
   "500px": {
     "errorMsg": "Oops! This page doesn\u2019t exist.",
     "errorType": "message",
-    "regexCheck": "^[a-z0-9_]$",
+    "regexCheck": "^[a-z0-9_]+$",
     "url": "https://500px.com/{}",
     "urlMain": "https://500px.com/",
     "username_claimed": "blue",