Marvin Humphrey
and 1 contributors

NAME

KinoSearch::Analysis::Tokenizer - Split a string into tokens.

DEPRECATED

The KinoSearch code base has been assimilated by the Apache Lucy project. The "KinoSearch" namespace has been deprecated, but development continues under our new name at our new home: http://lucy.apache.org/

SYNOPSIS

    my $whitespace_tokenizer
        = KinoSearch::Analysis::Tokenizer->new( pattern => '\S+' );

    # or...
    my $word_char_tokenizer
        = KinoSearch::Analysis::Tokenizer->new( pattern => '\w+' );

    # or...
    my $apostrophising_tokenizer = KinoSearch::Analysis::Tokenizer->new;

    # Then... once you have a tokenizer, put it into a PolyAnalyzer:
    my $polyanalyzer = KinoSearch::Analysis::PolyAnalyzer->new(
        analyzers => [ $case_folder, $word_char_tokenizer, $stemmer ], );

DESCRIPTION

Generically, "tokenizing" is a process of breaking up a string into an array of "tokens". For instance, the string "three blind mice" might be tokenized into "three", "blind", "mice".

KinoSearch::Analysis::Tokenizer decides where it should break up the text based on a regular expression compiled from a supplied pattern matching one token. If our source string is...

    "Eats, Shoots and Leaves."

... then a "whitespace tokenizer" with a pattern of "\\S+" produces...

    Eats, 
    Shoots 
    and 
    Leaves.

... while a "word character tokenizer" with a pattern of "\\w+" produces...

    Eats 
    Shoots 
    and 
    Leaves

... the difference being that the word character tokenizer skips over punctuation as well as whitespace when determining token boundaries.

CONSTRUCTORS

new( [labeled params] )

    my $word_char_tokenizer = KinoSearch::Analysis::Tokenizer->new(
        pattern => '\w+',    # required
    );
  • pattern - A string specifying a Perl-syntax regular expression which should match one token. The default value is \w+(?:[\x{2019}']\w+)*, which matches "it's" as well as "it" and "O'Henry's" as well as "Henry".

INHERITANCE

KinoSearch::Analysis::Tokenizer isa KinoSearch::Analysis::Analyzer isa KinoSearch::Object::Obj.

COPYRIGHT AND LICENSE

Copyright 2005-2011 Marvin Humphrey

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.