Search::queryparser parses uri query strings into a data structure to be handled by external search engines.

the query string can contain simple terms, "exact phrases", field names and comparison operators, '+/-' prefixes, parentheses, and boolean connectors.

the parser can be parameterized by regular expressions for specific notions of "term", "field name" or "operator" ; see the new method. the parser has no support for lemmatization or other term transformations : these should be done externally, before passing the query data structure to the search engine.