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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
In the case of a web application, the programmer may use the same regular expression to validate input on both the client and the server side of the system. An attacker could inspect the client code, looking for evil regular expressions, and send crafted input directly to the web server in order to hang it. [9]
JavaScript (/ ˈ dʒ ɑː v ə s k r ɪ p t /), often abbreviated as JS, is a programming language and core technology of the World Wide Web, alongside HTML and CSS. Ninety-nine percent of websites use JavaScript on the client side for webpage behavior. [10] Web browsers have a dedicated JavaScript engine that executes the client code.
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 rendered contents of the page. To perform a regex search, use the ordinary search box with the syntax insource:/regex/ or intitle:/regex/.
The following may seem trivial for Unix-experienced people, but a collection of ready-to-use regular expressions can help people who don't know anything or much about regular expressions. For these people: You can use regular expressions in many editors to perform complex editing tasks. This will give the headings more (or fewer) equal signs (=).
A full-featured in-browser text editor for Wikipedia edit pages. Provides wikicode syntax highlighting, regular expression search and replace, MS Word and HTML to wikicode conversion, server-independent Show preview and Show changes, fullscreen editing mode, and single-click fixing of common mistakes. Any Cacycle: Edit Top: 1.1.1
Form validation framework(s) WebObjects: Java Yes Yes Push-pull Yes EOF: WOUnit (JUnit), TestNG, Selenium in Project WONDER Yes Yes Yes Google Web Toolkit: Java, JavaScript Yes Yes JPA with RequestFactory JUnit (too early), jsUnit (too difficult), Selenium (best) via Java Yes Bean Validation ZK: Java, ZUML jQuery: Yes Push-pull Yes any J2EE ORM ...