This page (revision-1) was last changed on 29-Nov-2024 16:16 by UnknownAuthor

Only authorized users are allowed to rename pages.

Only authorized users are allowed to delete pages.

Page revision history

Version Date Modified Size Author Changes ... Change note

Page References

Incoming links Outgoing links

Version management

Difference between version and

At line 1 added 14 lines
!!! Overview
[{$pagename}] ([RegEx]) in theoretical computer science and formal language theory, a regular expression (sometimes called a rational expression) is a sequence of characters that define a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. "find and replace"-like operations. The concept arose in the 1950s, when the American mathematician Stephen Kleene formalized the description of a regular language, and came into common use with the Unix text processing utilities ed, an editor, and grep, a filter.
In modern usage, [{$pagename}]s are often distinguished from the derived, but fundamentally distinct concepts of [RegEx] or [regexp], which no longer describe a regular language. See below for details.
[{$pagename}] are so useful in computing that the various systems to specify [regexps] have evolved to provide both a basic and extended standard for the grammar and syntax; modern regexps heavily augment the standard. [RegEx] processors are found in several search engines, search and replace dialogs of several word processors and text editors, and in the command lines of text processing utilities, such as sed and AWK.
Many programming languages provide [{$pagename}] capabilities, some built-in (for example [Perl], [JavaScript], [Ruby], [AWK], and Tcl) and others via a standard library (for example .NET languages, [Java], [Python], POSIX C, and C++ since C++11). Most other languages offer regexps via a library.
!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
----
* [#1] - [Regular_expression|Wikipedia:Regular_expression/|target='_blank'] - based on information obtained 2016-06-14-