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In computer science, the two-way string-matching algorithm is a string-searching algorithm, discovered by Maxime Crochemore and Dominique Perrin in 1991. [1] It takes a pattern of size m, called a “needle”, preprocesses it in linear time O(m), producing information that can then be used to search for the needle in any “haystack” string, taking only linear time O(n) with n being the ...
Japanese - 網の目に風とまらず (ami no me ni kaze tomarazu) Literally meaning "You can't catch wind in a net." Another idiom of improbability is 畑に蛤 ( Hata ni hamaguri ) which means "finding clams in a field".
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Example: A task is to sew a patch onto a pair of blue pants. The best needle to do the threading is a 4-cm-long needle with a 3-millimeter eye. This needle is hidden in a haystack along with 1,000 other needles varying in size from 1 cm to 6 cm. Satisficing claims that the first needle that can sew on the patch is the one that should be used.
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"Needle in a Haystack", an episode of the TV series Mythbusters "Needle in a Haystack", a 1964 pop song record by The Velvelettes Terms in a two-way string-matching algorithm
A simple and inefficient way to see where one string occurs inside another is to check at each index, one by one. First, we see if there is a copy of the needle starting at the first character of the haystack; if not, we look to see if there's a copy of the needle starting at the second character of the haystack, and so forth.