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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.
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 .
Using whitespace characters to layout text is a convention. Applications sometimes render whitespace characters as visible markup so that a user can see what is normally not visible. Typically, a user types a space character by pressing spacebar, a tab character by pressing Tab ↹ and newline by pressing ↵ Enter.
Then uncheck the regex box, and replace the spaces inside the numbers with commas. Then paste the text and number columns next to each other again. If you have a simple list (not in a table) and you want to replace spaces with commas or periods, you can paste the list into a text editor (Notepad for example). Use replace (from edit menu in ...
Causes whitespace characters (spaces, tabs, and newlines) in the pattern to be ignored, so that they can be used to keep the pattern visually organized. [ a ] ^ To match whitespace characters while the IgnorePatternWhitespace option is enabled, they must be identified with character classes, i.e. \s (whitespace), \n (newline), or \t (tab).
Removes whitespace (spaces, tabs, and newlines). count: Returns the number of times the needle (first string) appears in the haystack (second string). If only one argument is given, splits it by commas and returns the number of segments. rcount: Similar to count but the needle uses a regular expression instead. Can be made case-insensitive by ...
Most of the functions provided here can be invoked with named parameters, unnamed parameters, or a mixture. If named parameters are used, Mediawiki will automatically remove any leading or trailing whitespace from the parameter. Depending on the intended use, it may be advantageous to either preserve or remove such whitespace.
Replace multiple spacing after full stop with single spacing Match:\. +([A-Za-z\[]) Replace:. $1 Note: This may replace double-spaces inside <pre> tags, so you need to be careful, or skip pages containing <pre> tags using Special Replace (under Find and Replace Advanced settings).