Utf8.charpos
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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
int, int utf8.charpos ( string input [[, int charpos = 0 ], int offset = 1 ] )
Required Arguments
- input: A string character sequence
Optional Arguments
NOTE: When using optional arguments, you might need to supply all arguments before the one you wish to use. For more information on optional arguments, see optional arguments.
- charpos: An integer representing the beginning position (offset will be added/subtracted).
- offset: An integer representing the offset to charpos.
Returns
Returns the integer position as in a byte string and the integer codepoint at this position, nil otherwise.
Example
Click to collapse [-]
ServerThis 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
Click to collapse [-]
ClientThis 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