Class ICUFoldingFilter
A TokenFilter that applies search term folding to Unicode text, applying foldings from UTR#30 Character Foldings.
Inheritance
System.Object
ICUFoldingFilter
Implements
IDisposable
Inherited Members
Namespace: Lucene.Net.Analysis.Icu
Assembly: Lucene.Net.ICU.dll
Syntax
public sealed class ICUFoldingFilter : ICUNormalizer2Filter, IDisposableRemarks
This filter applies the following foldings from the report to unicode text:
- Accent removal
- Case folding
- Canonical duplicates folding
- Dashes folding
- Diacritic removal (including stroke, hook, descender)
- Greek letterforms folding
- Han Radical folding
- Hebrew Alternates folding
- Jamo folding
- Letterforms folding
- Math symbol folding
- Multigraph Expansions: All
- Native digit folding
- No-break folding
- Overline folding
- Positional forms folding
- Small forms folding
- Space folding
- Spacing Accents folding
- Subscript folding
- Superscript folding
- Suzhou Numeral folding
- Symbol folding
- Underline folding
- Vertical forms folding
- Width folding
Additionally, Default Ignorables are removed, and text is normalized to NFKC. All foldings, case folding, and normalization mappings are applied recursively to ensure a fully folded and normalized result.
Constructors
| Improve this Doc View SourceICUFoldingFilter(TokenStream)
Create a new ICUFoldingFilter on the specified input
Declaration
public ICUFoldingFilter(TokenStream input)Parameters
| Type | Name | Description |
|---|---|---|
| TokenStream | input |
Implements
IDisposable