Text-Affixes version 0.06 ========================== Text::Affixes - Basis for prefixes and suffixes analisys of text =head1 SYNOPSIS use Text::Affixes; my $text = "Hello, world. Hello, big world."; my $prefixes = get_prefixes($text); # $prefixes now holds # { # 3 => { # 'Hel' => 2, # 'wor' => 2, # } # } # or $prefixes = get_prefixes({min => 1, max => 2},$text); # $prefixes now holds # { # 1 => { # 'H' => 2, # 'w' => 2, # 'b' => 1, # }, # 2 => { # 'He' => 2, # 'wo' => 2, # 'bi' => 1, # } # } # the use for get_suffixes is similar =head1 DESCRIPTION Provides methods for prefixe and suffix analisys of text. =head1 METHODS =head2 get_prefixes Extracts prefixes from text. You can specify the minimum and maximum number of characters of prefixes you want. Returns a reference to a hash, where the specified limits are mapped in hashes; each of those hashes maps every prefix in the text into the number of times it was found. By default, both minimum and maximum limits are 3. If the minimum limit is greater than the lower one, an empty hash is returned. A prefix is considered to be a sequence of word characters (\w) in the beginning of a word (that is, after a word boundary) that does not reach the end of the word ("regular expressionly", a prefix is the $1 of /\b(\w+)\w/). # extracting prefixes of size 3 $prefixes = get_prefixes( $text ); # extracting prefixes of sizes 2 and 3 $prefixes = get_prefixes( {min => 2}, $text ); # extracting prefixes of sizes 3 and 4 $prefixes = get_prefixes( {max => 4}, $text ); # extracting prefixes of sizes 2, 3 and 4 $prefixes = get_prefixes( {min => 2, max=> 4}, $text); =head2 get_suffixes The get_suffixes function is similar to the get_prefixes one. You should read the documentation for that one and than come back to this point. A suffix is considered to be a sequence of word characters (\w) in the end of a word (that is, before a word boundary) that does not start at the beginning of the word ("regular expressionly" speaking, a prefix is the $1 of /\w(\w+)\b/). # extracting suffixes of size 3 $suffixes = get_suffixes( $text ); # extracting suffixes of sizes 2 and 3 $suffixes = get_suffixes( {min => 2}, $text ); # extracting suffixes of sizes 3 and 4 $suffixes = get_suffixes( {max => 4}, $text ); # extracting suffixes of sizes 2, 3 and 4 $suffixes = get_suffixes( {min => 2, max=> 4}, $text); =head1 OPTIONS Apart from deciding on a minimum and maximum size for prefixes or suffixes, you can also decide on some configuration options. =head2 exclude_numbers Set to 0 if you consider numbers as part of words. Default value is 1. # this get_suffixes( {min => 1, max => 1, exclude_numbers => 0}, "Hello, but w8" ); # returns this: { 1 => { 'o' => 1, 't' => 1, '8' => 1 } } =head2 lowercase Set to 1 to extract all prefixes in lowercase mode. Default value is 0. ATTENTION: This does not mean that prefixes with uppercased characters won't be extracted. It means they will be extracted after being lowercased. # this... get_prefixes( {min => 2, max => 2, lowercase => 1}, "Hello, hello"); # returns this: { 2 => { 'he' => 2 } } =head1 TO DO =over 6 =item * Make it more efficient (use C for that) =back =head1 AUTHOR Jose Castro, C<< >> =head1 COPYRIGHT & LICENSE Copyright 2004 Jose Castro, All Rights Reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. =cut