27 Dec '13, 8am

Efficient substring searching @myen

Efficient substring searching @myen

Boyer-Moore-Horspool itself also has variants. In Timo Raita’s 1992 paper “Tuning the Boyer-Moore-Horspool String Searching Algorithm” he asserts that text is rarely random and that there usually exist strong dependencies between characters. Thus there are smarter ways to match the needle: instead of matching it backwards from the last character, one should first match the last character, then the first character, then the middle one, etc. The advantage of this heuristic becomes obvious if we consider an example in which we search for the needle “hello world” in a haystack that often contains the word “world” in combination with a word other than “hello”, e.g. “beautiful world”, “my world”, “another world”. When the algorithm matches the last needle character “d”, instead of wasting time matching “worl” as well, it can match the first needle character “h” and immediately d...

Full article: http://blog.phusion.nl/2010/12/06/efficient-substring-sea...

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