(defcustom ido-enable-prefix nil
"*Non-nil means only match if the entered text is a prefix of file name.
This behavior is like the standard emacs-completion.
-Nil means to match if the entered text is an arbitrary substring.
+nil means to match if the entered text is an arbitrary substring.
Value can be toggled within `ido' using `ido-toggle-prefix'."
:type 'boolean
:group 'ido)