Bug 1853021: Fixing a potential performance regression caused by Bug1852071.r=janv,dom-storage-reviewers

Differential Revision: https://phabricator.services.mozilla.com/D188127

dom/quota/OriginParser.cpp

@@ -477,6 +477,10 @@ void OriginParser::HandleTrailingSeparator() {
 }
 
 bool IsUUIDOrigin(const nsCString& aOrigin) {
+  if (!StringBeginsWith(aOrigin, kUUIDOriginScheme)) {
+    return false;
+  }
+
   static const std::regex pattern(
       "^uuid://[0-9A-Fa-f]{8}-[0-9A-Fa-f]{4}-4[0-9A-Fa-f]{3}-[89ABab"
       "][0-9A-Fa-f]{3}-[0-9A-Fa-f]{12}$");