class RuboCop::Cop::Performance::RegexpMatch

def last_match_used?(match_node)
  scope_root = scope_root(match_node)
  body = scope_root ? scope_body(scope_root) : match_node.ancestors.last
  range = range_to_search_for_last_matches(match_node, body, scope_root)
  find_last_match(body, range, scope_root)
end