diff --git a/mathics/core/parser/tokeniser.py b/mathics/core/parser/tokeniser.py
index 37d652a650..5d05ae3414 100644
--- a/mathics/core/parser/tokeniser.py
+++ b/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' \/\/ '),