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Regular expressions are used in search engines, in search and replace dialogs of word processors and text editors, in text processing utilities such as sed and AWK, and in lexical analysis. Regular expressions are supported in many programming languages. Library implementations are often called an "engine", [4] [5] and many of these are ...
The literal starts with r followed by any number of #, followed by one ". Further " contained in the literal are considered part of the literal, unless followed by at least as many # as used after the opening r. As such, a string literal opened with r#" cannot have "# in its content.
Regular expressions (or regex) are a common and very versatile programming technique for manipulating strings. On Wikipedia you can use a limited version of regex called a Lua pattern to select and modify bits of text from a string. The pattern is a piece of code describing what you are looking for in the string.
The / character must be backslash-escaped everywhere it appears inside a regex – even inside square brackets or quotation marks.. matches any single character. For example, insource:/yes.no/ is matched by yes/no, yes no, yesuno, etc. ( ) group a sequence of characters into an atomic unit. | goes
For example, prefix:help:t finds Help pagenames that begin with "T". When the string has zero characters all pages in the given namespace are found. When the string has all the characters a pagename, a single page is found. The string is not case sensitive. The namespace can be an namespace alias, like WP for Wikipedia.
For example, prefix:help:t finds Help pagenames that begin with "T". When the string has zero characters all pages in the given namespace are found. When the string has all the characters a pagename, a single page is found. The string is not case sensitive. The namespace can be an namespace alias, like WP for Wikipedia.
$1, $2 etc. if the "find" expression is a regular expression and regex is ticked will use the values from "Find" Each pair of brackets in a regular expression corresponds to a string, so if you searched for (123)4(56)78, $1 would correspond to 123 and $2 would correspond to 56
Pages in category "Regular expressions" The following 12 pages are in this category, out of 12 total. This list may not reflect recent changes. ...