Check value in combobox

[sal21]

I need to check if user insert correct value in combobox...

i have this code but not work corect!

If Not Left$(Me.MATR_CERCA.Text, 2) = "AB" And Not IsNumeric(Right$(Me.MATR_CERCA.Text, 5)) Then

only admitted value contain prefix "AB" + nnnnn (nnnnn is only a numeric value)

[HansV]

Instead of And, use Or.