On Mon, 11 Jan 2021 18:13:58 -0000 Paul <claws at thewildbeast.co.uk> wrote: > Try: > > [a-z]+optimiz[a-z]+.com Although I suppose this is closer to what you want: [a-zA-Z0-9.]+@[a-z]+optimiz[a-z]+.com You get the idea! with regards Paul