<function name="len" parent="utf8" type="libraryfunc"> <description>Returns the number of UTF-8 sequences in the given string between positions startPos and endPos (both inclusive). If it finds any invalid UTF-8 byte sequence, returns false as well as the position of the first invalid byte.</description> <realm>Shared</realm> <file line="197-L224">lua/includes/modules/utf8.lua</file> <file line="202-L229">lua/includes/modules/utf8.lua</file> <args> <arg name="string" type="string">The string to calculate the length of.</arg> <arg name="startPos" type="number" default="1">The starting position to get the length from.</arg> <arg name="endPos" type="number" default="-1">The ending position to get the length from.</arg> </args> <rets> <ret name="" type="number">The number of UTF-8 characters in the string. If there are invalid bytes, this will be false.</ret> <ret name="" type="number">The position of the first invalid byte. If there were no invalid bytes, this will be nil.</ret> </rets> </function> <example> <description>Demonstrates output of this function compared to <page>string.len</page> when given a string that contains Russian text.</description> <code> print( string.len( "Мёнём" ) ) print( utf8.len( "Мёнём" ) ) </code> <output> ``` 11 5 ``` </output> </example>