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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.
The English Wikipedia has several templates and Lua modules which can format or manipulate strings. In this context a "string" is any piece of text forming part of a page. This help page covers a few useful techniques; look in the navbox below for the full catalogue of templates.
format – Every list element will first be formatted with this format string; see here for how to construct this string. The string must contain at least one %s sequence. template=1 – List elements should be taken from the calling template. Returns the resulting string. quote Wrap the string in quotes; quotes can be chosen for a specific ...
string expected, got function. Some important things like mw.ustring.gmatch actually return functions, not strings - see Functions below. no such module. You #invoked a module that didn't exist — or wrote #invoke:Module:x instead of #invoke:x. the function specified did not exist. You #invoked a module, but the field after the name of the ...
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
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:
This function allows one to replace a target string or pattern within another string. To Lua programmers: this function works internally by calling mw.ustring.gsub.
Help:Lua for beginners; Wikipedia:Lua style guide – standards to improve the readability of code through consistency "What do converted templates look like?" (slideshow) Wikipedia:Lua string functions; Wikipedia:Guide to Scribbling