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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.
Square brackets [ ] are used to match one single character in the string from a list of choices. [abc] matches the letters a, b, or c. With ^ right after [they indicate "anything but": [^abc] = not a, b, or c. Inside brackets and when not the first character, a minus -indicates a range: [a-z] matches one single character from a, b, c, …, z.
C: String.format(formatstring, items) Java: C: String.Format(formatstring, items) VB .NET, C#, F#.NET (format formatstring items) Scheme (SRFI 28) Lisp (format nil formatstring items) Common Lisp: Lisp (format formatstring items) Clojure: Lisp formatstring-f items: Windows PowerShell.NET [NSString stringWithFormat:formatstring, items] Objective ...
The Lua software was initially configured with a small, 10-second timeout limit, for the combined operation of all Lua code when formatting a page. By comparison, the markup-based templates have a 60-second timeout (6x higher time limit), and when the servers are slow, the markup-based templates could format perfectly, up through 59 seconds ...
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Marshalling data between C and Lua functions is also done using the stack. To call a Lua function, arguments are pushed onto the stack, and then the lua_call is used to call the actual function. When writing a C function to be directly called from Lua, the arguments are read from the stack. Here is an example of calling a Lua function from C:
The string-search functions in Lua script can run extremely fast, comparing millions of characters per second. For example, a search of a 40,000-character article text, for 99 separate words (passed as 99 parameters in a template), ran within one second of Lua CPU clock time.
Scribunto Lua reference manual (Manual for the Mediawiki implementation) Programming in Lua (Official book/introduction to Lua) Lua tutorials at lua-users.org; Wiktionary:Lua on English Wiktionary: contains notes on efficiency and on dealing with Unicode and UTF-8