Package org.apache.lucene.analysis.pattern

Class SimplePatternTokenizerFactory

  • public class SimplePatternTokenizerFactory
extends TokenizerFactory
    Factory for SimplePatternTokenizer, for matching tokens based on the provided regexp.

    This tokenizer uses Lucene RegExp pattern matching to construct distinct tokens for the input stream. The syntax is more limited than PatternTokenizer, but the tokenization is quite a bit faster. It takes two arguments:

    • "pattern" (required) is the regular expression, according to the syntax described at RegExp
    • "maxDeterminizedStates" (optional, default 10000) the limit on total state count for the determined automaton computed from the regexp

    The pattern matches the characters to include in a token (not the split characters), and the matching is greedy such that the longest token matching at a given point is created. Empty tokens are never created.

    For example, to match tokens delimited by simple whitespace characters: 

     <fieldType name="text_ptn" class="solr.TextField" positionIncrementGap="100">
   <analyzer>
     <tokenizer class="solr.SimplePatternTokenizerFactory" pattern="[^ \t\r\n]+"/>
   </analyzer>
 </fieldType>
    Since:
    6.5.0
    See Also:
    SimplePatternTokenizer

    • Field Detail

      • maxDeterminizedStates

        private final int maxDeterminizedStates

    • Constructor Detail

      • SimplePatternTokenizerFactory

        public SimplePatternTokenizerFactory​(java.util.Map<java.lang.String,​java.lang.String> args)
        Creates a new SimplePatternTokenizerFactory