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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.
RE2 (software) RE2 is a software library which implements a regular expression engine via finite-state machines using automata theory, in contrast to almost all other regular expression libraries, which use backtracking implementations. It provides a C++ interface. RE2 was implemented and used by Google.
List of regular expression libraries. FPGA accelerated >100 Gbit/s regex engine for cybersecurity, financial, e-commerce industries. hardware-accelerated search acceleration using RegEx available for ASIC, FPGA and cloud. Enables massively parallel content processing at ultra-high speeds. ^ Formerly called Regex++.
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Regular language. In theoretical computer science and formal language theory, a regular language (also called a rational language) [1][2] is a formal language that can be defined by a regular expression, in the strict sense in theoretical computer science (as opposed to many modern regular expression engines, which are augmented with features ...
In the theory of formal languages, the pumping lemma for regular languages is a lemma that describes an essential property of all regular languages. Informally, it says that all sufficiently long strings in a regular language may be pumped —that is, have a middle section of the string repeated an arbitrary number of times—to produce a new ...
Pages in category "Regular expressions". The following 13 pages are in this category, out of 13 total. This list may not reflect recent changes . Regular expression.
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 ...