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This module directly imports all functions from the Vorlage:Luaref library. Documentation for each function can be found there.

The module takes an indefinite number of arguments. Arguments given as Vorlage:Para, Vorlage:Para, etc, are read first, and are used as strings. All remaining numerical arguments are coerced to number type if possible, and remain strings if not. If you wish for a numerical (i.e. unnamed or "Vorlage:Para", "Vorlage:Para") to remain a string, you can simply escape it by inserting \ at the beginning of the string.

Note that MediaWiki will always trim whitespace from named arguments; to give arguments with surrounding whitespace you must use unnamed parameters starting with \.

How to pass inconvenient strings

To pass this...	Write this	Explanation
" 0123 "	Vorlage:Para	To get surrounding whitespace must use unnamed, but must precede with \ to indicate that it isn't a number.
"0123"	Vorlage:Para	If you don't need to preserve whitespace use Vorlage:Para etc.
"0123"	Vorlage:Para	If you don't need to preserve whitespace explicitly use Vorlage:Para etc.
In another template, to pass its parameter {{{1}}}, preserving whitespace	Vorlage:Para	Must provide the \ with unknown string input.
In another template, to pass its parameter {{{1}}}, stripping whitespace	Vorlage:Para
In another template, to pass its parameter {{{1}}}, stripping whitespace	Vorlage:Para

You can also wrap results in tags. All other unused arguments will be passed to Vorlage:Luaref

Usage

{{#invoke:Ustring|function_name|arg1|arg2|...}} is equivalent to Vorlage:Luaref

Example using mw.ustring.sub

{{#invoke:Ustring|sub|s1=abcde|2|4}}

produces:

bcd

Example using mw.ustring.gsub

{{#invoke:Ustring|gsub|s1=1234|23|}}

produces:

14

Example using mw.ustring.char

&#{{#invoke:ustring|char|49|48|59}}

produces:




Example using mw.ustring.match

{{#invoke:Ustring|match|s1=abcde|s2=(c%w)}}

produces:

cd

Note: Only the first match is returned. Additional returns are omitted because mw.ustring.gsub's second return value is generally undesirable.

Example using tag arguments

{{#invoke:Ustring|match
|s1={{Module:Ustring}}|%s%s%sif%snot%s[^%s]+%sthen.+%
<!--enter an actual newline character to match '\n'-->%s%s%send
|tag=syntaxhighlight|lang=lua}}

produces:

			if not fargs.tag then
				return (what(unpack(args)))		-- Outside parens truncate to first result avoiding tail call
			end
			local tagargs = {}
			for x, y in pairs(fargs) do
				if not fargsused[x] then tagargs[x] = y end
			end

Note that:

<syntaxhighlight lang="lua">{{#invoke:Ustring|match
|s1={{Module:Ustring}}|%s%s%sif%snot%s[^%s]+%sthen.+%
<!--enter an actual newline character to match '\n'-->%s%s%send}}</syntaxhighlight>

produces:

{{#invoke:Ustring|match
|s1={{Module:Ustring}}|%s%s%sif%snot%s[^%s]+%sthen.+%
<!--enter an actual newline character to match '\n'-->%s%s%send}}

Errors

Errors from accessing Vorlage:Luaref should be maintained, e.g.:

{{#invoke:Ustring|xyzzy}}

should produce:

and

{{#invoke:Ustring|maxPatternLength}}

should produce: