KMP:
       http://www.ics.uci.edu/~eppstein/161/960227.html

   http://www.devarticles.com/c/a/Development-Cycles/Pattern-Matching-Algorithms-Demystified-KMP/1/





==========================


Approximate matching:


http://www.catalysoft.com/articles/StrikeAMatch.html

http://www.catalysoft.com/articles/MatchingSimilarStrings.html?article=Tame_the_Beast_by_Matching_Similar_Strings_14