Merge pull request #991 from mathics/fix989

Fix #989

Author: mmatera

mathics/core/parser/tokeniser.py

@@ -122,7 +122,7 @@
     ('RuleDelayed', r' (\:\>)|\uF51F '),
     ('UndirectedEdge', r' (\<\-\>)|\u29DF '),
     ('ReplaceRepeated', r' \/\/\. '),
-    ('ReplaceAll', r' \/\. '),
+    ('ReplaceAll', r' (\/\.)(?=[^0-9]) '),
 
     ('Postfix', r' \/\/ '),