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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 .
MediaWiki's regular expression syntax works like this: Most characters represent themselves. For example, insource:/C-3p0/ will search for pages containing the literal string "C-3p0" (case-sensitive).
A regular expression or regex is a sequence of characters that define a pattern to be searched for in a text. Each occurrence of the pattern may then be automatically replaced with another string, which may include parts of the identified pattern. AutoWikiBrowser uses the .NET flavor of regex. [1]
Track 1 can store up to 79 alphanumeric characters. ISO 7813 specifies the following structure for track 1 data: [2] SS : Start sentinel "%" FC : Format code "B" (The format described here. Format "A" is reserved for proprietary use.) PAN : Payment card number 4400664987366029, up to 19 digits; FS : Field separator "^"
Two digits were prepended to existing subscriber numbers, according to the former numbering range, type of service and carrier. [ 1 ] It was expanded again from 8 to 10 digits on 31 January 2021, with two digits again prepended based on service and carrier.
A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.
In 1999, a general reform was introduced to telephone numbers, including the 1, 2 and 3 for area codes as explained above, and adding a 4 at the beginning of all subscriber's numbers. However, since the reform some local numbers starting with a 5 are beginning to appear. Moreover, a hyphen is usually placed to separate the last four digits.
To perform a regex search, use the ordinary search box with the syntax insource:/regex/ or intitle:/regex/. The expression regex denotes a regular expression in MediaWiki-flavored regular expression syntax.