LlStringLength

Returns an integer that is the number of characters in str (not counting the null).

 
// assumptions: 
//    object name: LSLWiki
//    script name: _lslwiki
 
default
{
    state_entry()
    {
        string HowLongAmI = "123";
        integer strlen = llStringLength(HowLongAmI);
        llOwnerSay( "'" + HowLongAmI + "' has " +(string) strlen + " characters.");
        // The owner of object LSLWiki will hear 
        // LSLWiki: '123' has 3 characters.
    }
}
 

Functions