tokens[0] not in {"search", "offset-search"} or
(tokens[0] == "offset-search" and
((not len(tokens) > 2) or (not tokens[1].isdigit())))):
tokens[0] not in {"search", "offset-search"} or
(tokens[0] == "offset-search" and
((not len(tokens) > 2) or (not tokens[1].isdigit())))):