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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d5a/structstrings_1_1boyer__moore_1_1pattern.html">strings::boyer_moore::pattern</a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">A structure representing all the data we need to search the preprocessed pattern in text. <a href="../../dd/d5a/structstrings_1_1boyer__moore_1_1pattern.html#details">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<a name="details" id="details"></a><h2 id="header-details" class="groupheader">Detailed Description</h2>
<div class="textblock"><p>The <a href="https://en.wikipedia.org/wiki/Boyer%E2%80%93Moore_string-search_algorithm" target="_blank">Boyer–Moore</a> algorithm searches for occurrences of pattern P in text T by performing explicit character comparisons at different alignments. Instead of a brute-force search of all alignments (of which there are n - m + 1), Boyer–Moore uses information gained by preprocessing P to skip as many alignments as possible. </p>
<p>The key insight in this algorithm is that if the end of the pattern is compared to the text, then jumps along the text can be made rather than checking every character of the text. The reason that this works is that in lining up the pattern against the text, the last character of the pattern is compared to the character in the text.</p>
<p>If the characters do not match, there is no need to continue searching backwards along the text. This leaves us with two cases.</p>
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<p>The shift rules are implemented as constant-time table lookups, using tables generated during the preprocessing of P. </p><dl class="section author"><dt>Author</dt><dd><a href="https://github.com/stoychoX" target="_blank">Stoycho Kyosev</a> </dd></dl>
<p class="definition">Definition in file <a class="el" href="../../d3/db2/boyer__moore_8cpp_source.html">boyer_moore.cpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a77c872c08612d7b8861ba13bc9881cbd">&#9670;&#160;</a></span>APLHABET_SIZE</h2>
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