Swift: Attempt to speed up evaluation of the private information regex for Swift.

swift/ql/lib/codeql/swift/security/SensitiveExprs.qll

@@ -64,9 +64,9 @@ class SensitivePrivateInfo extends SensitiveDataType, TPrivateInfo {
   override string toString() { result = "private information" }
 
   override string getRegexp() {
+    // we've had good results for the e-mail heuristic in Swift, which isn't part of the default regex. Add it in.
     result = HeuristicNames::maybeSensitiveRegexp(SensitiveDataClassification::private())
-    or
-    result = "(?is).*e(mail|_mail).*"
+      .replaceAll(".*(", ".*(e(mail|_mail)|")
   }
 }