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The shortcut family of templates is put into context here, but they each have their own documentation pages, see below. A shortcut template is similar to the {} template, but it adds a visual box graphic to the rendered page, as well as providing an alternative name. Creating a redirect page is a requirement to fulfill the shortcut mechanism.
As an ad hoc sandbox, you can show the wikitext of a section like this, (already saved in the database), modify some of the patterns in the regex-search-link template calls on this page, do a Show Preview, and see what matches when you click on the newly formed regex search-link, all quite safely, and without changing a thing in the database.
templates; Any text transcluded from a template is indexed as if it were really present on its target page. (In other words, by default, a keyword search is done on the text of the rendered Wikipedia page, not on the page source itself. However, you can change this by using insource:keyword to search the source markup instead of the rendered page
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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 .
Search with a regular expression: Ctrl+Meta+s: All searches use regular expressions. Search and replace with a regular expression Ctrl+Meta+% Emoji Picker ⊞ Win+. or ⊞ Win+; Ctrl+⌘ Cmd+Space: Search+⇧ Shift+Space
The use of the system stack for backtracking can be problematic in PCRE1, which is why this feature of the implementation was changed in PCRE2. The heap is now used for this purpose, and the total amount can be limited. The problem of stack overflow, which came up regularly with PCRE1, is no longer an issue with PCRE2 from release 10.30 (2017).
File Explorer is the default user interface for accessing and managing the file systems, but it is possible to perform such tasks on Windows without File Explorer. For example, the File Run menu option in Task Manager on Windows NT or later functions independently of File Explorer, as do commands run within a command prompt window.