# 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.