--- reg
+++ reg
@@ -7,3 +7,3 @@
 #~ <debug:on>
-#~ <nocontext: >  # Switch off context substring retention 
+<nocontext: >  # Switch off context substring retention 
 
@@ -77,9 +77,9 @@
 <token: exp>
-  (?: <e> (?: <minus> | <plus> )?  (?: <DIGIT> )+  )
+  (?: <e> (?: <minus> | <plus> )?  (?: <[DIGIT]> )+  )
 
 <token: frac>
-  (?: <decimal_point> (?: <DIGIT> )+  )
+  (?: <decimal_point> (?: <[DIGIT]> )+  )
 
 <token: int>
-  <zero> | (?: <digit1_9> (?: <DIGIT> )*  )
+  <zero> | (?: <digit1_9> (?: <[DIGIT]> )*  )