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Converts the UTF-8 codepoint position to byte-string position.

Note

Code point characters beyond the byte value range (0-127) require at least 2 bytes to represent the character

Syntax

 utf8.charpos ( )

Code Examples

Example 1 Example 2

server

This example takes the second codepoint character and shows the byte-string position and the codepoint character code.

local position, codepoint = utf8.charpos( "Привет", 2 )
print( position, codepoint )  -- 3, 1088

server

This example extracts the first character by calculating the character length with the UTF8 functions and the inbuilt Lua function string.sub, which processes byte strings.

local input = "Привет мир" -- Hello World
local from = utf8.charpos( input, 1 ) -- 1
local to = utf8.charpos( input, 2 ) -- 3

local byteLength = to - from
outputConsole( byteLength ) -- 2

local character = string.sub( input, from, byteLength )
outputConsole( character ) -- П

See Also

Reference

• Scripting Functions