Added suppoort for regex in whitelist

freqtrade/plugins/pairlistmanager.py

@@ -59,6 +59,11 @@ class PairListManager():
         """The expanded blacklist (including wildcard expansion)"""
         return expand_pairlist(self._blacklist, self._exchange.get_markets().keys())
 
+    @property
+    def expanded_whitelist(self) -> List[str]:
+        """The expanded whitelist (including wildcard expansion)"""
+        return expand_pairlist(self._whitelist, self._exchange.get_markets().keys())
+
     @property
     def name_list(self) -> List[str]:
         """Get list of loaded Pairlist Handler names"""
@@ -129,6 +134,21 @@ class PairListManager():
                 pairlist.remove(pair)
         return pairlist
 
+    def verify_whitelist(self, pairlist: List[str], logmethod) -> List[str]:
+        """
+        Verify and remove items from pairlist - returning a filtered pairlist.
+        Logs a warning or info depending on `aswarning`.
+        Pairlist Handlers explicitly using this method shall use
+        `logmethod=logger.info` to avoid spamming with warning messages
+        :return: pairlist - blacklisted pairs
+        """
+        try:
+            whitelist = self.expanded_whitelist
+        except ValueError as err:
+            logger.error(f"Pair blacklist contains an invalid Wildcard: {err}")
+            return []
+        return whitelist
+
     def create_pair_list(self, pairs: List[str], timeframe: str = None) -> ListPairsWithTimeframes:
         """
         Create list of pair tuples with (pair, timeframe)