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{{short description|Optimization of Boyer–Moore string search algorithm}}
In [[computer science]], the '''Apostolico–Giancarlo algorithm''' is a variant of the [[Boyer–Moore string search algorithm]], the basic application of which is searching for occurrences of a pattern <math>P</math> in a text <math>T</math>. As with other comparison-based string searches, this is done by aligning <math>P</math> to a certain index of <math>T</math> and checking whether a match occurs at that index. <math>P</math> is then shifted relative to <math>T</math> according to the rules of the Boyer–Moore algorithm, and the process repeats until the end of <math>T</math> has been reached. Application of the Boyer-Moore shift rules often results in large chunks of the text being skipped entirely.
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