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Note: Lua patterns are not regular expressions in the traditional POSIX sense, and they are not even a subset of regular expressions. But they share many constructs with regular expressions (more below). Lua patterns are used to define, find and handle a pattern in a string. It can do the common search and replace action in a text, but it has ...
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.
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:
Wikipedia:Lua style guide – standards to improve the readability of code through consistency "What do converted templates look like?" (slideshow) Help:Lua debugging – a how-to guide about debugging Lua modules; Help:Lua for beginners – basic tutorial and pointers; Wikipedia:Lua string functions – string performance considerations and limits
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
LuaJIT, a just-in-time implementation of Lua, has an FFI that allows "calling external C functions and using C data structures from pure Lua code". [4] [5]: 35 Nim has an FFI which enables it to use source from C, C++, and Objective-C. It can also interface with JavaScript.
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.
So, much of what these books explain about Lua standard library functions and variables that come with the language is either irrelevant or untrue here. The original API specification — the Lua standard library functions and variables that are supposed to be available in modules — is given at MW:Extension:Scribunto/API specification ...