org.apache.lucene.analysis.pattern

## Class SimplePatternTokenizer

- java.lang.Object
- - org.apache.lucene.util.AttributeSource
  - - org.apache.lucene.analysis.TokenStream
    - - org.apache.lucene.analysis.Tokenizer
      - - org.apache.lucene.analysis.pattern.SimplePatternTokenizer

- All Implemented Interfaces:
    Closeable, AutoCloseable

      public final class SimplePatternTokenizer
      extends Tokenizer

  This tokenizer uses a Lucene `RegExp` or (expert usage) a pre-built determinized `Automaton`, to locate tokens. The regexp syntax is more limited than `PatternTokenizer`, but the tokenization is quite a bit faster. The provided regex should match valid token characters (not token separator characters, like `String.split`). The matching is greedy: the longest match at a given start point will be the next token. Empty string tokens are never produced.
  WARNING: This API is experimental and might change in incompatible ways in the next release.

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource

      `AttributeSource.State`

  - ### Field Summary

    - ### Fields inherited from class org.apache.lucene.analysis.Tokenizer

      `input`

    - ### Fields inherited from class org.apache.lucene.analysis.TokenStream

      `DEFAULT_TOKEN_ATTRIBUTE_FACTORY`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `SimplePatternTokenizer(AttributeFactory factory, Automaton dfa)` Runs a pre-built automaton.
    `SimplePatternTokenizer(AttributeFactory factory, String regexp, int maxDeterminizedStates)` See `RegExp` for the accepted syntax.
    `SimplePatternTokenizer(Automaton dfa)` Runs a pre-built automaton.
    `SimplePatternTokenizer(String regexp)` See `RegExp` for the accepted syntax.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `end()`
    `boolean` | `incrementToken()`
    `void` | `reset()`

    - ### Methods inherited from class org.apache.lucene.analysis.Tokenizer

      `close, correctOffset, setReader`

    - ### Methods inherited from class org.apache.lucene.util.AttributeSource

      `addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, copyTo, endAttributes, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, removeAllAttributes, restoreState, toString`

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- - ### Constructor Detail

    - #### SimplePatternTokenizer

          public SimplePatternTokenizer(String regexp)

      See `RegExp` for the accepted syntax.

    - #### SimplePatternTokenizer

          public SimplePatternTokenizer(Automaton dfa)

      Runs a pre-built automaton.

    - #### SimplePatternTokenizer

          public SimplePatternTokenizer(AttributeFactory factory,
                                        String regexp,
                                        int maxDeterminizedStates)

      See `RegExp` for the accepted syntax.

    - #### SimplePatternTokenizer

          public SimplePatternTokenizer(AttributeFactory factory,
                                        Automaton dfa)

      Runs a pre-built automaton.

  - ### Method Detail

    - #### incrementToken

          public boolean incrementToken()
                                 throws IOException

      Specified by:
        `incrementToken` in class `TokenStream`
      Throws:
        `IOException`

    - #### end

          public void end()
                   throws IOException

      Overrides:
        `end` in class `TokenStream`
      Throws:
        `IOException`

    - #### reset

          public void reset()
                     throws IOException

      Overrides:
        `reset` in class `Tokenizer`
      Throws:
        `IOException`

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