# Uses of Class
org.apache.lucene.queryparser.flexible.core.QueryParserHelper

Packages that use QueryParserHelper
Package
Description
org.apache.lucene.queryparser.flexible.precedence
Precedence Query Parser Implementation
org.apache.lucene.queryparser.flexible.standard
Lucene Flexible Query Parser Implementation

- ## Uses of QueryParserHelper in org.apache.lucene.queryparser.flexible.precedence

  Subclasses of QueryParserHelper in org.apache.lucene.queryparser.flexible.precedence
  Modifier and Type
  Class
  Description
  `class`
  `PrecedenceQueryParser`
  This query parser works exactly as the standard query parser ( `StandardQueryParser` ), except that it respect the boolean precedence, so <a AND b OR c AND d> is parsed to <(+a +b) (+c +d)> instead of <+a +b +c +d>.

- ## Uses of QueryParserHelper in org.apache.lucene.queryparser.flexible.standard

  Subclasses of QueryParserHelper in org.apache.lucene.queryparser.flexible.standard
  Modifier and Type
  Class
  Description
  `class`
  `StandardQueryParser`
  The `StandardQueryParser` is a pre-assembled query parser that supports most features of the classic Lucene query parser, allows dynamic configuration of some of its features (like multi-field expansion or wildcard query restrictions) and adds support for new query types and expressions.