j'ai en fait bien peur que ça ne soit pas possible :
https://help.ubuntu.com/community/HowToReadline
"If you use a Bash shell, you might know it uses the Readline library for editing command lines. Many other programs use it too."
[...]
"A word is defined by Readline to be a sequence of letters or numbers; it is not possible to change this definition."
dommage...
