amatch - Approximate Matching Extension for Ruby
Description
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.
Installation
To install this extension as a gem type
gem install amatch
into the shell.
Download
The homepage of this library is located at
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 = Amatch::DamerauLevenshtein.new("pattern")
# => #<Amatch::DamerauLevenshtein:0x007fc3483dd278>
m.match("pattren")
# => 1
"pattern language".damerau_levenshtein_similar("language of patterns")
# => 0.19999999999999996
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 mailto:flori@ping.de
License
Apache License, Version 2.0 – See the COPYING file in the source archive.