自分メモ:ランキングなどについて
Percentage rank of matches using Levenshtein Distance matching
http://stackoverflow.com/questions/10405440/percentage-rank-of-matches-using-levenshtein-distance-matching
Sort by Relevance in a basic mysql search engine (PHP)
http://stackoverflow.com/questions/12678058/sort-by-relevance-in-a-basic-mysql-search-engine
How can I give rank to dates?
http://stackoverflow.com/questions/12491646/how-can-i-give-rank-to-dates
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levenshtein で文字列のレーベンシュタイン距離を計算
http://www.plustar.jp/lab/blog/?p=6077
文字列の類似度を測る(1) レーベンシュタイン距離
http://f-n.daa.jp/2011/11/27/levenshtein/