Then is one to whom the evil of his deed has been made attractive so he considers it good [like one rightly guided]? For indeed, Allah sends astray whom He wills and guides whom He wills. So do not let yourself perish over them in regret. Indeed, Allah is Knowing of what they do.
Meaning:-
Astray: into error, away from the correct path or direction
Perish: to suffer destruction or ruin:, disappear
Regret: feel sad, repentant, or disappointment over something that has happened or been done.