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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 .
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
When using AWB, you can refresh the typo list by selecting "File → Refresh status/typos" (CTRL-R). This is useful when you are modifying the typo list on Wikipedia while using AWB to test/process the modification (but basic testing should first be done offline—e.g. by using AWB's Regex Tester or "Find and replace").
Regex searches that take too long will "time out" and return only partial results. Overuse of slow regex searches might cause temporary throttling of the feature for yourself and/or everyone on Wikipedia. (However, you cannot affect the site performance of Wikipedia as a whole simply by abusing regex search.) Remember that a single regex search ...
RE2 is a software library which implements a regular expression engine. It uses finite-state machines, in contrast to most other regular expression libraries. RE2 supports a C++ interface. RE2 was implemented by Google and Google uses RE2 for Google products. [3]
Web testing tools Web browser based (model) Scriptable Scripting language Recorder Multiple domain Frames BugBug.io: Yes (Chromium-based) Yes JavaScript: Yes Yes Yes eggPlant Functional: Yes (IE, Firefox, Safari, Opera, Chrome) Yes SenseTalk: Yes iMacros: Yes (Firefox, Chrome, IE) Yes iMacro Script: Yes Yes Yes Katalon Studio: Yes
If the regex itself is affected by user input, such as a web service permitting clients to provide a search pattern, then an attacker can inject a malicious regex to consume the server's resources. Therefore, in most cases, regular expression denial of service can be avoided by removing the possibility for the user to execute arbitrary patterns ...
TRE is an open-source library for pattern matching in text, [2] which works like a regular expression engine with the ability to do approximate string matching. [3] It was developed by Ville Laurikari [1] and is distributed under a 2-clause BSD-like license.