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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.
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 ...
Lua: string size: Smalltalk: LEN(string) LEN_TRIM(string) Fortran: StringLength[string] Mathematica «FUNCTION» LENGTH(string) or «FUNCTION» BYTE-LENGTH(string) number of characters and number of bytes, respectively COBOL: string length string: a decimal string giving the number of characters Tcl: ≢ string: APL: string.len() Number of ...
Wikipedia does not have the "StringFunctions" series of parser functions (listed below), and is not going to get them (per phab:T8455). Instead, templates use Lua (via Module:String or otherwise), alongside existing parser functions. None of these functions will work, but they have alternatives: #len – use {{#invoke:string|len}}
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:
If it isn't a table, it's a string, a number, a boolean, a function, or a nil. Libraries are tables. string.gmatch is the "gmatch" entry in the table named by the global variable string. Arguments that you receive from MediaWiki are tables. But they're a bit special. Arrays are tables that follow a specific convention.
Wikipedia:Lua string functions – string performance considerations and limits; Wikipedia:Guide to Scribbling – how to write templates that use Scribunto/Lua; Wikipedia:Guide to Scribbling/Programmers' Quick start Guide to Lua – a list of essential points; Wikipedia:Comparable Lua functions to wikitext – how to convert wikitext to Lua
This Lua module is used on approximately 1,880,000 pages, or roughly 3% of all pages. To avoid major disruption and server load, any changes should be tested in the module's /sandbox or /testcases subpages, or in your own module sandbox.