Boyer

Category: Utilities    

Date Listed/Updated: 2016-03-31 06:42:43

File size: 113 KB

OS: Java,Linux,Mac OS X,Unix,Win2000,Win7 x32,Win7 x64,WinServer,WinVista,WinVista x64,WinXP  License: freeware  Price($): 0.00

Author/Publisher name: Roedy Green

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Description:

Fast string search (indexOf) using the Boyer-Moore algorithm. Incorporate this class into your own Java programs to rapidly search strings. use: import com.mindprod.Boyer.Boyer; ... Boyer b = new Boyer("dogcatwombat"); int where = b.indexOf("cat"); or int where = Boyer.indexOf("dogcatwombat","cat"); Boyer-Moore is about twice as fast as String.indexOf when the string you are searching in is 2K or over and the pattern you are searching for is 4 characters or longer. String.indexOf is particularly slow when the pattern begins with a common letter such as "e". Boyer-Moore is fastest when the pattern is long and composed only of uncommon letters, e.g. "z" or "^". If you use a char[] instead of String for your text to be searched, it will run an additional 33% faster. Boyer automatically reverts to String.indexOf when that would be faster.

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Tags: Boyer-Moore  string search  search  indexOf  Java  fast string search  string handling 

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