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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.
A metacharacter is a character that has a special meaning to a computer program, such as a shell interpreter or a regular expression (regex) engine.. In POSIX extended regular expressions, there are 14 metacharacters that must be escaped (preceded by a backslash (\)) in order to drop their special meaning and be treated literally inside an expression: opening and closing square brackets ([and ...
glob (programming) In computer programming, glob ( / ɡlɒb /) patterns specify sets of filenames with wildcard characters. For example, the Unix Bash shell command mv *.txt textfiles/ moves all files with names ending in .txt from the current directory to the directory textfiles. Here, * is a wildcard and *.txt is a glob pattern.
Pressing ↵ Enter or clicking on the magnifying glass when the box is empty takes you directly to Wikipedia's search page . If your search matches a page name the search box may navigate instead of search. To get search results instead, prepend the tilde ~ character to the first word of the title.
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 ...
Specials. Specials is a short Unicode block of characters allocated at the very end of the Basic Multilingual Plane, at U+FFF0–FFFF. Of these 16 code points, five have been assigned since Unicode 3.0: U+FFFC OBJECT REPLACEMENT CHARACTER, placeholder in the text for another unspecified object, for example in a compound document.
Wildcard character. In software, a wildcard character is a kind of placeholder represented by a single character, such as an asterisk ( * ), which can be interpreted as a number of literal characters or an empty string. It is often used in file searches so the full name need not be typed. [1]
This template helps field the details in the wikitext of any page on the wiki. Normally searches ignore non-alphanumeric characters, but regular expressions (regex) accept all characters, plus metacharacters. This template acts as a doorway by helping to develop a database query before running it on the wiki, and it does this by way of a search ...