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Some classes of regular languages can only be described by deterministic finite automata whose size grows exponentially in the size of the shortest equivalent regular expressions. The standard example here is the languages L k consisting of all strings over the alphabet {a,b} whose kth-from-last letter equals a.
Trigram search is a method of searching for text when the exact syntax or spelling of the target object is not precisely known [1] or when queries may be regular expressions. [2] It finds objects which match the maximum number of three consecutive character strings (i.e. trigrams) in the entered search terms, which are generally near matches. [3]
For function that manipulate strings, modern object-oriented languages, like C# and Java have immutable strings and return a copy (in newly allocated dynamic memory), while others, like C manipulate the original string unless the programmer copies data to a new string. See for example Concatenation below.
For example, insource:/yes\.\no/ will search for pages containing the literal string "yes.no" (case-sensitive). Regex experts should note that \n does not mean "newline," \d does not mean "digit," and so on: In MediaWiki syntax, the only use of \ is to escape metacharacters.
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
insource:/regexp/ targets the entire wikitext of every page in the search domain as one long string of characters per page, either having a pattern or not. This is the "regular expression" (or regexp, or regex).
In addition to dangers posed by Christmas trees and string lights, officials are once again issuing warning about toys. CPSC, in collaboration with U.S. Customs and Border Protection, seized more ...
regexp matches a regular expression against a string. regsub Performs substitutions based on regular expression pattern matching. uplevel is a command that allows a command script to be executed in a scope other than the current innermost scope on the stack. upvar creates a link to variable in a different stack frame.