utf8.charpos()

Type Function

Library utf8.*

Return value Numbers

Revision 2017.3060

Keywords utf8, UTF-8, Unicode, string, charpos

See also utf8.codepoint()

Overview

Converts UTF-8 position to byte offset depending on usage:

If only offset is specified, returns the byte offset of this UTF-8 character index, for example the offset from the beginning of the string.
If charpos and offset are specified, a new charpos will be calculated by adding or subtracting the UTF-8 character offset to/from the current charpos.

In both cases, this function returns a new character position and code point (number) at this position.

Syntax

utf8.charpos( s, [charpos,] offset )

s _^(required)

String. Any string.

charpos _^(optional)

Number. The character position in the UTF-8 string.

offset _^(required)

Number. The character offset.

Example

local utf8 = require( "plugin.utf8" )

local testStr = "♡ 你好，世界 ♡"

print( utf8.sub( testStr, 3, 3 ) )  --> 你

print( utf8.charpos( testStr, 3 ) )  --> 5  20320

Type	Function
Library	utf8.*
Return value	Numbers
Revision	2017.3060
Keywords	utf8, UTF-8, Unicode, string, charpos
See also	utf8.codepoint()