<function name="offset" parent="utf8" type="libraryfunc"> <description>Returns the byte-index of the n'th UTF-8-character after the given startPos (nil if none). startPos defaults to 1 when n is positive and -1 when n is negative. If n is zero, this function instead returns the byte-index of the UTF-8-character startPos lies within.</description> <realm>Shared</realm> <file line="226-L296">lua/includes/modules/utf8.lua</file> <file line="231-L301">lua/includes/modules/utf8.lua</file> <args> <arg name="string" type="string">The string that you will get the byte position from.</arg> <arg name="n" type="number">The position to get the beginning byte position from.</arg> <arg name="startPos" type="number" default="1 when n>=0, -1 otherwise">The offset for n.</arg> </args> <rets> <ret name="" type="number">Starting byte-index of the given position.</ret> </rets> </function> <example> <description>Returns the byte-index where the character at the 5th byte begins.</description> <code>print(utf8.offset("( ͡° ͜ʖ ͡°)", 5))</code> <output>7</output> </example> <example> <description>Safely truncates the string that may contain UTF-8 characters. The first print demonstrates the problem of string.sub</description> <code>local s = 'Текст - Cyrillic text example' print(string.sub(s,1,5)) print(string.sub(s,1,utf8.offset(s,5)))</code> <output>Те? Текст </output> </example>