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Different syntaxes for writing regular expressions have existed since the 1980s, one being the POSIX standard and another, widely used, being the Perl syntax. Regular expressions are used in search engines, in search and replace dialogs of word processors and text editors, in text processing utilities such as sed and AWK, and in lexical ...
A regex search scans the text of each page on Wikipedia in real time, character by character, to find pages that match a specific sequence or pattern of characters. Unlike keyword searching, regex searching is by default case-sensitive, does not ignore punctuation, and operates directly on the page source (MediaWiki markup) rather than on the ...
The index is based on alphanumeric characters; it stores no information on non-alphanumeric characters. If you type any punctuation or brackets into the search box when doing an indexed search, those characters will be silently discarded. A basic indexed search searches only article space by default. matches only letters and numbers. This is ...
The other word must differ by no more than two letters. Not the first two letters. The first two letters must match. Two letters swapped. Two letters changed. Two letters added, two letters subtracted, or one subtracted and one added. But it can differ by one letter in these ways. A fuzzy search matches the word exactly plus words like it.
In the normal case, we only have to look at one or two characters for each wrong position to see that it is a wrong position, so in the average case, this takes O(n + m) steps, where n is the length of the haystack and m is the length of the needle; but in the worst case, searching for a string like "aaaab" in a string like "aaaaaaaaab", it ...
Then, since the alphabet has only four characters, at least two of the first five characters in the string must be duplicates. They are separated by at most three characters. If the duplicate characters are separated by 0 characters, or 1, pump one of the other two characters in the string, which will not affect the substring containing the ...
From a given set of input strings, Vernadat and Richetin build a so-called successor automaton, consisting of one state for each distinct character and a transition between each two adjacent characters' states. [11] For example, the singleton input set {aabbaabb} leads to an automaton corresponding to the regular expression (a + ⋅b +) *.
The main article for this category is regular expression. regex-1 • regex-2 • regex-3 • regex-4 • regex-N • regex-5; regex-3: