# Package org.apache.lucene.analysis.standard

Fast, general-purpose grammar-based tokenizers.

See: Description

Interface Summary
Interface | Description
--- | ---
StandardTokenizerInterface | Internal interface for supporting versioned grammars.

Class Summary
Class | Description
--- | ---
ClassicAnalyzer | Filters `ClassicTokenizer` with `ClassicFilter`, `LowerCaseFilter` and `StopFilter`, using a list of English stop words.
ClassicFilter | Normalizes tokens extracted with `ClassicTokenizer`.
ClassicFilterFactory | Factory for `ClassicFilter`.
ClassicTokenizer | A grammar-based tokenizer constructed with JFlex
ClassicTokenizerFactory | Factory for `ClassicTokenizer`.
StandardAnalyzer | Filters `StandardTokenizer` with `StandardFilter`, `LowerCaseFilter` and `StopFilter`, using a list of English stop words.
StandardFilter | Normalizes tokens extracted with `StandardTokenizer`.
StandardFilterFactory | Factory for `StandardFilter`.
StandardTokenizer | A grammar-based tokenizer constructed with JFlex.
StandardTokenizerFactory | Factory for `StandardTokenizer`.
StandardTokenizerImpl | This class implements Word Break rules from the Unicode Text Segmentation algorithm, as specified in Unicode Standard Annex #29.
UAX29URLEmailAnalyzer | Filters `UAX29URLEmailTokenizer` with `StandardFilter`, `LowerCaseFilter` and `StopFilter`, using a list of English stop words.
UAX29URLEmailTokenizer | This class implements Word Break rules from the Unicode Text Segmentation algorithm, as specified in Unicode Standard Annex #29 URLs and email addresses are also tokenized according to the relevant RFCs.
UAX29URLEmailTokenizerFactory | Factory for `UAX29URLEmailTokenizer`.
UAX29URLEmailTokenizerImpl | This class implements Word Break rules from the Unicode Text Segmentation algorithm, as specified in Unicode Standard Annex #29 URLs and email addresses are also tokenized according to the relevant RFCs.

## Package org.apache.lucene.analysis.standard Description

Fast, general-purpose grammar-based tokenizers.

The `org.apache.lucene.analysis.standard` package contains three fast grammar-based tokenizers constructed with JFlex:

- `StandardTokenizer`: as of Lucene 3.1, implements the Word Break rules from the Unicode Text Segmentation algorithm, as specified in Unicode Standard Annex #29. Unlike `UAX29URLEmailTokenizer`, URLs and email addresses are not tokenized as single tokens, but are instead split up into tokens according to the UAX#29 word break rules.
  `StandardAnalyzer` includes `StandardTokenizer`, `StandardFilter`, `LowerCaseFilter` and `StopFilter`. When the `Version` specified in the constructor is lower than 3.1, the `ClassicTokenizer` implementation is invoked.
- `ClassicTokenizer`: this class was formerly (prior to Lucene 3.1) named `StandardTokenizer`. (Its tokenization rules are not based on the Unicode Text Segmentation algorithm.) `ClassicAnalyzer` includes `ClassicTokenizer`, `StandardFilter`, `LowerCaseFilter` and `StopFilter`.
- `UAX29URLEmailTokenizer`: implements the Word Break rules from the Unicode Text Segmentation algorithm, as specified in Unicode Standard Annex #29. URLs and email addresses are also tokenized according to the relevant RFCs.
  `UAX29URLEmailAnalyzer` includes `UAX29URLEmailTokenizer`, `StandardFilter`, `LowerCaseFilter` and `StopFilter`.