Dear Caml List

i have tried :
let _ =
  let s ="Hello world" in
  let str = Pcre.replace ~pat:"\\b" ~templ:"?" s in
  print_string s ;
  print_newline() ;
  print_string str ;
  print_newline();;

the result is
localhost# ./try
Hello world
?Hello?e?world?

however in  the mannul of pcre
\b means word boundary
so , i figure that the result maybe ?Hello? ?world?
i dont know where comes the "e" in the middle?

Thanks


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