=SI(OU(A1="";SOMMEPROD((CODE(STXT(A1&"[";LIGNE(INDIRECT("1:"&NBCAR(A1)+1));1))
>96)*1)=0);A1;GAUCHE(A1;EQUIV(VRAI;CODE(STXT(A1;LIGNE(INDIRECT("1:"&NBCAR(A1)));
1))>96;0)-1))&SI(MAX((CODE(STXT(A1&"[";LIGNE(INDIRECT("1:"&NBCAR(A1)+1));1))<91)
*LIGNE(INDIRECT("1:"&NBCAR(A1)+1)))=EQUIV(VRAI;CODE(STXT(A1&"µ";LIGNE(INDIRECT(
"1:"&NBCAR(A1)+1));1))>96;0)-1;"";" "&STXT(A1;MAX((CODE(STXT(A1;LIGNE(INDIRECT(
"1:"&NBCAR(A1)));1))<91)*LIGNE(INDIRECT("1:"&NBCAR(A1))));1))