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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
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 .
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 ...
Regular languages are a category of languages (sometimes termed Chomsky Type 3) which can be matched by a state machine (more specifically, by a deterministic finite automaton or a nondeterministic finite automaton) constructed from a regular expression. In particular, a regular language can match constructs like "A follows B", "Either A or B ...
Or create one yourself, and save it to the database so the query will find it. Open the wikitext, and enter a |pattern=. Prefix will be added later. Show Preview. See the pattern in the newly created search link. Click on the search link. Note the bold text in each match, the centered, complete query, and note the count off to the right.
Shows a text field at the top of diff pages and oldids that contains the short Special:Diff/ (or Special:Permalink/) format. 169: 76: diff-permalink-2 : Shows a text field at the top of diff pages and oldids that contains the short Special:Diff/ (or Special:Permalink/) format with square brackets [[]] around the page name. 25: 17: diffcur
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Regular expressions and nondeterministic finite automata are two representations of formal languages. For instance, text processing utilities use regular expressions to describe advanced search patterns, but NFAs are better suited for execution on a computer.