Lucy::Analysis::RegexTokenizer - Split a string into tokens.
my $whitespace_tokenizer = Lucy::Analysis::RegexTokenizer->new( pattern => '\S+' ); # or... my $word_char_tokenizer = Lucy::Analysis::RegexTokenizer->new( pattern => '\w+' ); # or... my $apostrophising_tokenizer = Lucy::Analysis::RegexTokenizer->new; # Then... once you have a tokenizer, put it into a PolyAnalyzer: my $polyanalyzer = Lucy::Analysis::PolyAnalyzer->new( analyzers => [ $word_char_tokenizer, $normalizer, $stemmer ], );
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”.
Lucy::Analysis::RegexTokenizer 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…
pattern
"Eats, Shoots and Leaves."
… then a “whitespace tokenizer” with a pattern of "\\S+" produces…
"\\S+"
Eats, Shoots and Leaves.
… while a “word character tokenizer” with a pattern of "\\w+" produces…
"\\w+"
Eats Shoots and Leaves
… the difference being that the word character tokenizer skips over punctuation as well as whitespace when determining token boundaries.
my $word_char_tokenizer = Lucy::Analysis::RegexTokenizer->new( pattern => '\w+', # required );
Create a new RegexTokenizer.
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”.
\w+(?:[\x{2019}']\w+)*
my $inversion = $regex_tokenizer->transform($inversion);
Take a single Inversion as input and returns an Inversion, either the same one (presumably transformed in some way), or a new one.
inversion - An inversion.
Lucy::Analysis::RegexTokenizer isa Lucy::Analysis::Analyzer isa Clownfish::Obj.
To install LucyX::Search::Filter, copy and paste the appropriate command in to your terminal.
cpanm
cpanm LucyX::Search::Filter
CPAN shell
perl -MCPAN -e shell install LucyX::Search::Filter
For more information on module installation, please visit the detailed CPAN module installation guide.