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I haven't been able to find documentation of which characters compound the punctuation set "%p" in Lua.
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> = string. match("foo 123 bar", '%d%d%d') -- %d matches a digit 123 > = string. match("text with an Uppercase letter", '%u') -- %u matches an uppercase letter U. Making the letter after the % uppercase inverts the class, so %D will match all non-digit characters.
Valid in Lua, where %w is (almost) the equivalent of \w in other languages. ^[%w-.]+$ means match a string that is entirely composed of alphanumeric characters (letters and digits), dashes or dots.
gsub() function has three arguments, the first is the subject string, in which we are trying to replace a substring to another substring, the second argument is the pattern that we want to replace in the given string, and the third argument is the string from which we want to replace the pattern.
The answer is locale dependent, it is a direct interface to the C function.
Actually, if there is a C standard function which does something similar to the Lua function, it is near-certain that the Lua function just wraps the C function, warts and all, even without looking at the specific case.
(This is part of the reason file:read() still has trouble reading text with embedded zeroes in 5.2, maybe even will have in 5.3)
While Amaden gave a good answer for the "C" locale, and ColonelThirtyTwo gave the right way to check for the current locale, the C standard only says:
ispunct(): Theispunctfunction tests for any printing character that is one of a locale-specific set of punctuation characters for which neitherisspacenorisalnumis true. In the "C" locale,ispunctreturns true for every printing character for which neitherisspacenorisalnumis true.
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