diff --git a/gramps/gen/datehandler/_date_uk.py b/gramps/gen/datehandler/_date_uk.py
index 1fed3d3bf..445589b69 100644
--- a/gramps/gen/datehandler/_date_uk.py
+++ b/gramps/gen/datehandler/_date_uk.py
@@ -102,10 +102,10 @@ class DateParserUK(DateParser):
 
         _span_1 = ['з', 'від']
         # b.c.e. pattern also have "до" so skip "до н."
-        _span_2 = ['по', 'до?!\sн']
+        _span_2 = ['по', 'до(?!\s+н)']
         _range_1 = ['між']
         _range_2 = ['і', 'та']
-        self._span  =  re.compile("(%s)\s+(?P<start>.+)\s+(%s)\s+(?P<stop>.+)" %
+        self._span  = re.compile("(%s)\s+(?P<start>.+)\s+(%s)\s+(?P<stop>.+)" %
                                  ('|'.join(_span_1), '|'.join(_span_2)),
                                  re.IGNORECASE)
         self._range = re.compile("(%s)\s+(?P<start>.+)\s+(%s)\s+(?P<stop>.+)" %