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A regular expression (shortened as regex or regexp), [1] sometimes referred to as rational expression, [2] [3] is a sequence of characters that specifies a match pattern in text. Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings , or for input validation .
A numeronym like C10k is considered one word for proximity, but two words for matching. pluralized numbers, like "2010s" The following match the single term txt2regEx on a page: txt, 2, regex, reg, ex, txt2, 2reg, 2regex. None of those portions would match in a phrase search; only "txt2regex" would match. [5]
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 search results highlight occurrences in both the title and page content. Multiple intitle: filters may be used to search for words in titles regardless of order, or in different titles (i.e., redirects) for the same article. Regular expressions can be used with intitle:/regexp/ or the case insensitive intitle:/regexp/i.
these are two words; only the first transition divides such words, into two; a null space matches non-alphanumerics: game-folks matches gameFolks. for or digit-letter these match singly or together. In other words you don't need the space, but that also works to find either "word" of a camel case or mixed alphanumeric word.
For example, one might wish to find all occurrences of a "word" despite it having alternate spellings, prefixes or suffixes, etc. Another more complex type of search is regular expression searching, where the user constructs a pattern of characters or other symbols, and any match to the pattern should fulfill the search. For example, to catch ...
Regular expressions (or regex) are a common and very versatile programming technique for manipulating strings. On Wikipedia you can use a limited version of regex called a Lua pattern to select and modify bits of text from a string. The pattern is a piece of code describing what you are looking for in the string.
grep is a command-line utility for searching plaintext datasets for lines that match a regular expression.Its name comes from the ed command g/re/p (global regular expression search and print), which has the same effect.