API strlen

Return the length, in bytes, of the string passed.
 string.len(s)
 strlen(s)
==Example==
 s = "Lua" 
 print(string.len("Lua"), s:len(), #s) -- 3,3,3; the three methods are equivalent
 print(string.len("Lua\000user")) -- 8: Lua strings are 8 bit pure so \000 does not terminate
==See also==
* - for utf8-aware string length parsing.