Class DaitchMokotoffSoundex

Encodes a string into a Daitch-Mokotoff Soundex value.

Inheritance

System.Object

DaitchMokotoffSoundex

Implements

IStringEncoder

Namespace: Lucene.Net.Analysis.Phonetic.Language

Assembly: Lucene.Net.Analysis.Phonetic.dll

Syntax

public class DaitchMokotoffSoundex : object, IStringEncoder

Remarks

The Daitch-Mokotoff Soundex algorithm is a refinement of the Russel and American Soundex algorithms, yielding greater accuracy in matching especially Slavish and Yiddish surnames with similar pronunciation but differences in spelling.

The main differences compared to the other soundex variants are:

• coded names are 6 digits long
• the initial character of the name is coded
• rules to encoded multi-character n-grams
• multiple possible encodings for the same name (branching)

This implementation supports branching, depending on the used method:

• Encode(String)branching disabled, only the first code will be returned
• GetSoundex(String)branching enabled, all codes will be returned, separated by '|'

Note: this implementation has additional branching rules compared to the original description of the algorithm. The rules can be customized by overriding the default rules contained in the resource file Lucene.Net.Analysis.Phonetic.Language.dmrules.txt.

This class is thread-safe.

See: Wikipedia - Daitch-Mokotoff Soundex

See: Avotaynu - Soundexing and Genealogy

since 1.10

Constructors

DaitchMokotoffSoundex()

Creates a new instance with ASCII-folding enabled.

Declaration

public DaitchMokotoffSoundex()

DaitchMokotoffSoundex(Boolean)

Creates a new instance.

With ASCII-folding enabled, certain accented characters will be transformed to equivalent ASCII characters, e.g. è -> e.

Declaration

public DaitchMokotoffSoundex(bool folding)

Parameters

Type	Name	Description
System.Boolean	folding	If ASCII-folding shall be performed before encoding.

Methods

Encode(String)

Encodes a string using the Daitch-Mokotoff soundex algorithm without branching.

Declaration

public virtual string Encode(string source)

Parameters

Type	Name	Description
System.String	source	A string to encode.

Returns

Type	Description
System.String	A DM Soundex code corresponding to the string supplied.

See Also

GetSoundex(String)

GetSoundex(String)

Encodes a string using the Daitch-Mokotoff soundex algorithm with branching.

In case a string is encoded into multiple codes (see branching rules), the result will contain all codes, separated by '|'.

Example: the name "AUERBACH" is encoded as both

• 097400
• 097500

Thus the result will be "097400|097500".

Declaration

public virtual string GetSoundex(string source)

Parameters

Type	Name	Description
System.String	source	A string to encode.

Returns

Type	Description
System.String	A string containing a set of DM Soundex codes corresponding to the string supplied.

Implements

IStringEncoder

See Also

Soundex