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Regular expression - Wikipedia A regular expression (shortened as regex or regexp), [1] sometimes referred to as a 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
Comparison of regular expression engines - Wikipedia Regular Expression Flavor Comparison – Detailed comparison of the most popular regular expression flavors Regexp Syntax Summary Online Regular Expression Testing – with support for Java, JavaScript, Net, PHP, Python and Ruby Implementing Regular Expressions – series of articles by Russ Cox, author of RE2 Regular Expression Engines
Regular language - Wikipedia 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 that allow the recognition of non-regular languages) Alternatively
Pattern matching - Wikipedia In many programming languages, a particular syntax of strings is used to represent regular expressions, which are patterns describing string characters However, it is possible to perform some string pattern matching within the same framework that has been discussed throughout this article
Python syntax and semantics - Wikipedia Python syntax and semantics A snippet of Python code demonstrating binary search The syntax of the Python programming language is the set of rules that defines how a Python program will be written and interpreted (by both the runtime system and by human readers) The Python language has many similarities to Perl, C, and Java
Thompsons construction - Wikipedia In computer science, Thompson's construction algorithm, also called the McNaughton–Yamada–Thompson algorithm, [1] is a method of transforming a regular expression into an equivalent nondeterministic finite automaton (NFA) [2] This NFA can be used to match strings against the regular expression This algorithm is credited to Ken Thompson Regular expressions and nondeterministic finite
RE2 (software) - Wikipedia RE2 comes with a built-in Python wrapper, available on Python Package Index (PyPI) as google-re2 [7] The built-in regexp package in Go uses the same patterns and implementation as RE2, though it is written in Go [8] This is unsurprising, given Go's common staff from the Plan 9 team The RE2 algorithm has been rewritten in Rust as the package regex CloudFlare 's web application firewall uses
Category:Regular expressions - Wikipedia Pages in category "Regular expressions" The following 12 pages are in this category, out of 12 total This list may not reflect recent changes
Wikipedia:AutoWikiBrowser Regular expression - Wikipedia A regular expression or regex is a sequence of characters that define a pattern to be searched for in a text Each occurrence of the pattern may then be automatically replaced with another string, which may include parts of the identified pattern