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Many iterator functions act this way. You can keep separate counts for iterator functions by using different variables. For example, if you set q = mw. ustring. gmatch (text, "(x.)") in the same module, you can pull characters from the same piece of text (text) by evaluating d=q() without losing your place in a().
For including parser functions, variables and behavior switches, see Help:Magic words; For a guide to displaying mathematical equations and formulas, see Help:Displaying a formula; For a guide to editing, see Wikipedia:Contributing to Wikipedia; For an overview of commonly used style guidelines, see Wikipedia:Simplified Manual of Style
Help:Lua for beginners; Help:Lua debugging – about debugging Lua modules; Wikipedia:Lua style guide – standards to improve the readability of code through consistency; Module:Sandbox provides a pseudo-namespace for experimenting with Lua modules
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:
A function is a set of instructions that takes input values, processes them, and returns an output value. [1] This is much like what a template does: you give it arguments, it processes them, and you get a result. However, you can define many functions in one Lua module, whereas you can only define one template on one page.
Scribunto Lua reference manual; Programming in Lua; Introduction to Lua patterns; About regex. Lua "patterns" are based on Regex (Patterns are a reduced set of regex). Help:Lua metamodules: Lua in Wikipedia has several meta-modules available that can make core functions easily available.
The functions of the Module:SimpleDebug can be used for cases such as those mentioned above or for more complex cases: When variables or the returned value (or values) by a function are local. To see if the flow of the program goes through a point (to which you will label).
Lua can process text strings in excess of 230,000 characters, which allows the formatted contents of article pages to be used as input to string searches. However, there have been some limitations in string contents, such as hidden strings enclosed in nowiki-tag or pre-tag elements.