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

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

See:
Description

Interface Summary
StandardTokenizerInterface

Class Summary
ClassicAnalyzer: Filters `ClassicTokenizer` with `ClassicFilter`, `LowerCaseFilter` and `StopFilter`, using a list of English stop words.
ClassicFilter: Normalizes tokens extracted with `ClassicTokenizer`.
ClassicTokenizer: A grammar-based tokenizer constructed with JFlex
StandardAnalyzer: Filters `StandardTokenizer` with `StandardFilter`, `LowerCaseFilter` and `StopFilter`, using a list of English stop words.
StandardFilter: Normalizes tokens extracted with `StandardTokenizer`.
StandardTokenizer: A grammar-based tokenizer constructed with JFlex.

StandardTokenizerImpl

This class implements Word Break rules from the Unicode Text Segmentation algorithm, as specified in Unicode Standard Annex #29

Tokens produced are of the following types: <ALPHANUM>: A sequence of alphabetic and numeric characters <NUM>: A number <SOUTHEAST_ASIAN>: A sequence of characters from South and Southeast Asian languages, including Thai, Lao, Myanmar, and Khmer <IDEOGRAPHIC>: A single CJKV ideographic character <HIRAGANA>: A single hiragana character

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.
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

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.

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