Index: gc_core/py/ibdawg.py
==================================================================
--- gc_core/py/ibdawg.py
+++ gc_core/py/ibdawg.py
@@ -2,10 +2,11 @@
 # -*- coding: UTF-8 -*-
 
 import os
 import traceback
 import pkgutil
+import re
 from itertools import chain
 
 from . import str_transform as st
 from . import char_player as cp
 from .echo import echo
@@ -281,30 +282,34 @@
             return
         if iPos >= 0:
             print("\n   "+ " " * iPos + "|")
             self.drawPath(sWord[1:], iNextNodeAddr)
 
-    def select (self, sFilter=""):
-        "generator: returns all entries which morphology fits <sFilter>"
-        print("Filter: " + sFilter)
-        yield from self._select1(sFilter, 0, "")
-
+    def select (self, sPattern=""):
+        "generator: returns all entries which morphology fits <sPattern>"
+        zPattern = None
+        try:
+            zPattern = re.compile(sPattern)
+        except:
+            print("# Error in regex pattern")
+            traceback.print_exc()
+        yield from self._select1(zPattern, 0, "")
 
     # def morph (self, sWord):
     #     is defined in __init__
 
     # VERSION 1
-    def _select1 (self, sFilter, iAddr, sWord):
+    def _select1 (self, zPattern, iAddr, sWord):
         # recursive generator
         for nVal, jAddr in self._getArcs1(iAddr):
             if nVal < self.nChar:
                 # simple character
-                yield from self._select1(sFilter, jAddr, sWord + self.lArcVal[nVal])
+                yield from self._select1(zPattern, jAddr, sWord + self.lArcVal[nVal])
             else:
                 sEntry = sWord + "\t" + self.funcStemming(sWord, self.lArcVal[nVal])
                 for nMorphVal, _ in self._getArcs1(jAddr):
-                    if not sFilter or sFilter in self.lArcVal[nMorphVal]:
+                    if not zPattern or zPattern.search(self.lArcVal[nMorphVal]):
                         yield sEntry + "\t" + self.lArcVal[nMorphVal]
 
     def _morph1 (self, sWord):
         "returns morphologies of sWord"
         iAddr = 0