=SIERREUR(0+STXT(A2;PETITE.VALEUR(SI(ESTNUM(0+STXT(A2;LIGNE(INDIRECT("$1:"&NBCAR(A2)));1));LIGNE(INDIRECT("$1:"&NBCAR(A2))));1);CHERCHE("-";A2&"-";PETITE.VALEUR(SI(ESTNUM(0+STXT(A2;LIGNE(INDIRECT("$1:"&NBCAR(A2)));1));LIGNE(INDIRECT("$1:"&NBCAR(A2))));1))-PETITE.VALEUR(SI(ESTNUM(0+STXT(A2;LIGNE(INDIRECT("$1:"&NBCAR(A2)));1));LIGNE(INDIRECT("$1:"&NBCAR(A2))));1));"")