Class WildcardQuery

Implements the wildcard search query. Supported wildcards are , which matches any character sequence (including the empty one), and ?, which matches any single character. '' is the escape character.

Note this query can be slow, as it needs to iterate over many terms. In order to prevent extremely slow WildcardQueries, a Wildcard term should not start with the wildcard

This query uses the CONSTANT_SCORE_AUTO_REWRITE_DEFAULT rewrite method.

Inheritance
System.Object
Query
MultiTermQuery
AutomatonQuery
WildcardQuery
Inherited Members
System.Object.Equals(System.Object, System.Object)
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
Namespace: Lucene.Net.Search
Assembly: Lucene.Net.dll
Syntax
public class WildcardQuery : AutomatonQuery

Constructors

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WildcardQuery(Term)

Constructs a query for terms matching term.

Declaration
public WildcardQuery(Term term)
Parameters
Type Name Description
Term term

Fields

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WILDCARD_CHAR

Char equality with support for wildcards

Declaration
public const char WILDCARD_CHAR = '?'
Field Value
Type Description
System.Char
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WILDCARD_ESCAPE

Escape character

Declaration
public const char WILDCARD_ESCAPE = '\\'
Field Value
Type Description
System.Char
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WILDCARD_STRING

String equality with support for wildcards

Declaration
public const char WILDCARD_STRING = '*'
Field Value
Type Description
System.Char

Properties

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Term

Returns the pattern term.

Declaration
public virtual Term Term { get; }
Property Value
Type Description
Term

Methods

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ToAutomaton(Term)

Convert Lucene wildcard syntax into an automaton.

Note

This API is for internal purposes only and might change in incompatible ways in the next release.

Declaration
public static Automaton ToAutomaton(Term wildcardquery)
Parameters
Type Name Description
Term wildcardquery
Returns
Type Description
Automaton
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ToString(String)

Prints a user-readable version of this query.

Declaration
public override string ToString(string field)
Parameters
Type Name Description
System.String field
Returns
Type Description
System.String
Overrides

See Also