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diff --git a/matita/components/binaries/probe/macLexer.mll b/matita/components/binaries/probe/macLexer.mll
new file mode 100644
index 000000000..5e4c01d3d
--- /dev/null
+++ b/matita/components/binaries/probe/macLexer.mll
@@ -0,0 +1,43 @@
+(*
+    ||M||  This file is part of HELM, an Hypertextual, Electronic        
+    ||A||  Library of Mathematics, developed at the Computer Science     
+    ||T||  Department, University of Bologna, Italy.                     
+    ||I||                                                                
+    ||T||  HELM is free software; you can redistribute it and/or         
+    ||A||  modify it under the terms of the GNU General Public License   
+    \   /  version 2 or (at your option) any later version.      
+     \ /   This software is distributed as is, NO WARRANTY.     
+      V_______________________________________________________________ *)
+
+{
+   module O = Options
+   
+   let out s = if !O.debug_lexer then prerr_endline s
+}
+
+let OL  = "(*"
+let CL  = "*)" 
+let UNI = ['\x80'-'\xBF']+
+let SPC = ['\r' '\n' '\t' ' ']+
+let WRD = ['0'-'9' 'A'-'Z' 'a'-'z' '_']+
+let QT  = '"'
+
+rule token = parse
+   | OL     { out "COM"; block lexbuf; token lexbuf                     }
+   | QT     { out "STR"; O.chars := !O.chars + str lexbuf; token lexbuf }
+   | SPC    { out "SPC"; incr O.chars; token lexbuf                     }
+   | UNI    { out "UNI"; incr O.chars; token lexbuf                     }
+   | WRD    { out "WRD"; incr O.chars; token lexbuf                     }
+   | _      { out "CHR"; incr O.chars; token lexbuf                     }
+   | eof    { out "EOF"                                                 }
+and str = parse
+   | QT     { 2 }
+   | "\\\"" { succ (str lexbuf)                                         }
+   | UNI    { succ (str lexbuf)                                         }
+   | WRD    { succ (str lexbuf)                                         }
+   | _      { succ (str lexbuf)                                         }
+and block = parse
+   | CL     { ()                                                        }
+   | OL     { block lexbuf; block lexbuf                                }
+   | QT     { let _ = str lexbuf in block lexbuf                        }
+   | _      { block lexbuf                                              }