Note

Tests whether a character is alphanumeric.
Code

///////////////////////////////////////////////////////////////////////////
//  Copyright (C) Wizardry and Steamworks 2014 - License: GNU GPLv3      //
///////////////////////////////////////////////////////////////////////////
integer wasIsAlNum(string a) {
    if(a == "") return FALSE;
    integer x = llBase64ToInteger("AAAA" + 
        llStringToBase64(llGetSubString(a, 0, 0)));
    return (x >= 65 && x <= 90) || (x >= 97 && x <= 122) ||
        (x >= 48 && x <= 57);
}