amatch - Approximate Matching Extension for Ruby
Description
** This is a workaround version for Rubinius users that makes it possible to install this gem. For the original, see github.com/flori/amatch. Read the below description to see how you should include this gem in your Gemfile. **
This is a collection of classes that can be used for Approximate matching, searching, and comparing of Strings. They implement algorithms that compute the Levenshtein edit distance, Sellers edit distance, the Hamming distance, the longest common subsequence length, the longest common substring length, the pair distance metric, the Jaro-Winkler metric.
Download
The latest version of amatch can be found at
Online Documentation should be located at
Installation
Just type into the command line as root:
# ruby install.rb
If you have installed rake (rake.rubyforge.org), you can also type:
# rake install
To install this extension as a gem type
# gem install amatch-rbx
If you use Bundler, put this line in your Gemfile, and run ‘bundle`
# gem 'amatch-rbx', :require => 'amatch'
Examples
require 'amatch'
# => true
include Amatch
# => Object
m = Sellers.new("pattern")
# => #<Amatch::Sellers:0x40366324>
m.match("pattren")
# => 2.0
m.substitution = m.insertion = 3
# => 3
m.match("pattren")
# => 4.0
m.reset_weights
# => #<Amatch::Sellers:0x40366324>
m.match(["pattren","parent"])
# => [2.0, 4.0]
m.search("abcpattrendef")
# => 2.0
m = Levenshtein.new("pattern")
# => #<Amatch::Levenshtein:0x4035919c>
m.match("pattren")
# => 2
m.search("abcpattrendef")
# => 2
"pattern language".levenshtein_similar("language of patterns")
# => 0.2
m = Hamming.new("pattern")
# => #<Amatch::Hamming:0x40350858>
m.match("pattren")
# => 2
"pattern language".hamming_similar("language of patterns")
# => 0.1
m = PairDistance.new("pattern")
# => #<Amatch::PairDistance:0x40349be8>
m.match("pattr en")
# => 0.545454545454545
m.match("pattr en", nil)
# => 0.461538461538462
m.match("pattr en", /t+/)
# => 0.285714285714286
"pattern language".pair_distance_similar("language of patterns")
# => 0.928571428571429
m = LongestSubsequence.new("pattern")
# => #<Amatch::LongestSubsequence:0x4033e900>
m.match("pattren")
# => 6
"pattern language".longest_subsequence_similar("language of patterns")
# => 0.4
m = LongestSubstring.new("pattern")
# => #<Amatch::LongestSubstring:0x403378d0>
m.match("pattren")
# => 4
"pattern language".longest_substring_similar("language of patterns")
# => 0.4
m = Jaro.new("pattern")
# => #<Amatch::Jaro:0x363b70>
m.match("paTTren")
# => 0.952380952380952
m.ignore_case = false
m.match("paTTren")
# => 0.742857142857143
"pattern language".jaro_similar("language of patterns")
# => 0.672222222222222
m = JaroWinkler.new("pattern")
# #<Amatch::JaroWinkler:0x3530b8>
m.match("paTTren")
# => 0.971428571712403
m.ignore_case = false
m.match("paTTren")
# => 0.79428571505206
m.scaling_factor = 0.05
m.match("pattren")
# => 0.961904762046678
"pattern language".jarowinkler_similar("language of patterns")
# => 0.672222222222222
Author
Florian Frank [email protected]
License
This is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License Version 2 as published by the Free Software Foundation: www.gnu.org/copyleft/gpl.html