move Regex into a ParseRegExp file, and rename the class to RegExp

Author: erik-krogh

python/ql/lib/semmle/python/frameworks/Django.qll

@@ -2512,7 +2512,7 @@ module PrivateDjango {
           any(int i | i < routeHandler.getFirstPossibleRoutedParamIndex() | routeHandler.getArg(i))
       )
       or
-      exists(DjangoRouteHandler routeHandler, DjangoRouteRegex regexUse, Regex regex |
+      exists(DjangoRouteHandler routeHandler, DjangoRouteRegex regexUse, RegExp regex |
         regex.getAUse() = regexUse and
         routeHandler = this.getARequestHandler() and
         regexUse.getRouteSetup() = this

python/ql/lib/semmle/python/frameworks/Tornado.qll

@@ -423,7 +423,7 @@ module Tornado {
         not result = requestHandler.getArg(0)
       )
       or
-      exists(Function requestHandler, TornadoRouteRegex regexUse, Regex regex |
+      exists(Function requestHandler, TornadoRouteRegex regexUse, RegExp regex |
         regex.getAUse() = regexUse and
         requestHandler = this.getARequestHandler() and
         regexUse.getRouteSetup() = this