1. A computer-based filtering method driven by a ruleset for positive and negative filtering with flexible comparison operations, comprising: (a) creating a ruleset as an ordered collection of rules and having a single ruleset default action, wherein each said rule having a rule action, a comparison operation and at least one comparison data element; and (b) filtering an object from a ruleset result set by performing the comparison operation on the object and the comparison data element from the rule, wherein: the filtering step is invoking rules from the ruleset one-by-one to compare the object with each rule comparison data element to determine a next action, and the filtering step either stops after a first matching rule is found and the filtering comprises taking the rule action, or the filtering step stops after invoking all rules without finding a matching rule and the filtering comprises taking the ruleset default action, the method being implemented by a code being selected from the group comprising Java language, Windows .INI files, predefined code data structures and XML language.