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---@meta
---UTF-8 equivalent of string.byte
---@param s string
---@param i? integer
---@param j? integer
---@return integer
---@return ...
function string.ubyte(s, i, j) end
---UTF-8 equivalent of string.char
---@param byte integer
---@param ... integer
---@return string
---@return ...
function string.uchar(byte, ...) end
---UTF-8 equivalent of string.find
---@param s string
---@param pattern string
---@param init? integer
---@param plain? boolean
---@return integer start
---@return integer end
---@return ... captured
function string.ufind(s, pattern, init, plain) end
---UTF-8 equivalent of string.gmatch
---@param s string
---@param pattern string
---@param init? integer
---@return fun():string,...
function string.ugmatch(s, pattern, init) end
---UTF-8 equivalent of string.gsub
---@param s string
---@param pattern string
---@param repl string|table|function
---@param n integer
---@return string
---@return integer count
function string.ugsub(s, pattern, repl, n) end
---UTF-8 equivalent of string.len
---@param s string
---@param i? integer
---@param j? integer
---@param lax? boolean Do not check if string is invalid utf8
---@return integer
function string.ulen(s, i, j, lax) end
---UTF-8 equivalent of string.lower
---@param s string
---@return string
function string.ulower(s) end
---UTF-8 equivalent of string.match
---@param s string
---@param pattern string
---@param init? integer
---@return string | number captured
function string.umatch(s, pattern, init) end
---UTF-8 equivalent of string.reverse
---@param s string
---@param lax? boolean Do not check if string is invalid utf8
---@return string
function string.ureverse(s, lax) end
---UTF-8 equivalent of string.sub
---@param s string
---@param i integer
---@param j? integer
---@return string
function string.usub(s, i, j) end
---UTF-8 equivalent of string.upper
---@param s string
---@return string
function string.uupper(s) end
---Equivalent to utf8extra.escape()
---@param s string
---@return string utf8_string
function string.uescape(s) end
---Equivalent to utf8extra.charpos()
---@param s string
---@param charpos? integer
---@param index? integer
---@return integer charpos
---@return integer codepoint
function string.ucharpos(s, charpos, index) end
---Equivalent to utf8extra.next()
---@param s string
---@param charpos? integer
---@param index? integer
---@return integer charpos
---@return integer codepoint
function string.unext(s, charpos, index) end
---Equivalent to utf8extra.insert()
---@param s string
---@param idx? integer
---@param substring string
---@return string new_string
function string.uinsert(s, idx, substring) end
---Equivalent to utf8extra.remove()
---@param s string
---@param start? integer
---@param stop? integer
---@return string new_string
function string.uremove(s, start, stop) end
---Equivalent to utf8extra.width()
---@param s string
---@param ambi_is_double? boolean
---@param default_width? integer
---@return integer width
function string.uwidth(s, ambi_is_double, default_width) end
---Equivalent to utf8extra.widthindex()
---@param s string
---@param location integer
---@param ambi_is_double? boolean
---@param default_width? integer
---@return integer idx
---@return integer offset
---@return integer width
function string.uwidthindex(s, location, ambi_is_double, default_width) end
---Equivalent to utf8extra.title()
---@param s string
---@return string new_string
function string.utitle(s) end
---Equivalent to utf8extra.fold()
---@param s string
---@return string new_string
function string.ufold(s) end
---Equivalent to utf8extra.ncasecmp()
---@param a string
---@param b string
---@return integer result
function string.uncasecmp(a, b) end
---Equivalent to utf8extra.isvalid()
---@param s string
---@return boolean
function string.uisvalid(s) end
---Equivalent to utf8extra.clean()
---@param s string
---@param replacement_string? string
---@param non_consecutive? boolean
---@return string cleaned_string
---@return boolean was_valid
function string.uclean(s, replacement_string, non_consecutive) end
---Equivalent to utf8extra.invalidoffset()
---@param s string
---@param init? integer
---@return integer offset
function string.uinvalidoffset(s, init) end
---Equivalent to utf8extra.isnfc()
---@param s string
---@return boolean
function string.uisnfc(s) end
---Equivalent to utf8extra.normalize_nfc()
---@param s string
---@return string normal_string
---@return boolean was_n
function string.unormalize_nfc(s) end
---Equivalent to utf8.offset()
---@param s string
---@param n integer
---@param i? integer
---@return integer position_in_bytes
function string.uoffset(s, n, i) end
---Equivalent to utf8.codepoint()
---@param s string
---@param i? integer
---@param j? integer
---@param lax? boolean Do not check if string is invalid utf8
---@return integer code
---@return ...
function string.ucodepoint(s, i, j, lax) end
---Equivalent to utf8.codes()
---@param s string
---@param lax? boolean Do not check if string is invalid utf8
---@return fun():integer,integer
function string.ucodes(s, lax) end
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