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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 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 ...
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.
If you check the Regular expression box on the bottom of the page, the criteria you enter here will be acted on as it is a regular expression. Otherwise it will be searched as it were regular text case insensitive. Replace with: – The criteria you place in this box will be replaced with what was found in the Find section.
Enter your search criteria in the find box. This will allow you to search the edit box for the criteria you enter in this box. Regex — If checked indicates that the criteria entered in the find box is a regular expression and to search as a regex. Case sensitive — If checked the find will be searched as the case entered in the find box.
regex—Regular Expression; regexp—Regular Expression; RF—Radio Frequency; RFC—Request For Comments; RFI—Radio Frequency Interference; RFID—Radio Frequency Identification; RGB—Red, Green, Blue; RGBA—Red, Green, Blue, Alpha; RHL—Red Hat Linux; RHEL—Red Hat Enterprise Linux; REXX—Restructured Extended Executor Language; RIA ...
On the search results page, note the bold text in each match. Go back in your browser. Modify the regexp, and cycle until done. (Or don't go back, you may want to modify the query at the search box.) Expand the search domain, and test the accuracy of those results. You can trim or expand the number of the results using prefix:.
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. / is special because it indicates the end of the regex. For example, insource:/yes/no/ is treated the same as insource:/yes/ no (because the keyword search for no/ ignores punctuation).