The following functions retrieve all the elements of a CSV string and place them in a list.

///////////////////////////////////////////////////////////////////////////
//    Copyright (C) 2015 Wizardry and Steamworks - License: CC BY 2.0    //
///////////////////////////////////////////////////////////////////////////
list wasCSVToList(string csv) {
    list l = [];
    list s = [];
    string m = "";
    do {
        string a = llGetSubString(csv, 0, 0);
        csv = llDeleteSubString(csv, 0, 0);
        if(a == "") {
            jump continue;
        }
        if(a == ",") {
            if(llList2String(s, -1) != "\"") {
                l += m;
                m = "";
                jump continue;
            }
            m += a;
            jump continue;
        }
        if(a == "\"" && llGetSubString(csv, 0, 0) == a) {
            m += a;
            csv = llDeleteSubString(csv, 0, 0);
            jump continue;
        }
        if(a == "\"") {
            if(llList2String(s, -1) != a) {
                s += a;
                jump continue;
            }
            s = llDeleteSubList(s, -1, -1);
            jump continue;
        }
        m += a;
@continue;
    } while(csv != "");
    // postcondition: length(s) = 0
    if(llStringLength(m) == 0) {
        return l;
    }
    return l + m;
}

///////////////////////////////////////////////////////////////////////////
//    Copyright (C) 2015 Wizardry and Steamworks - License: CC BY 2.0    //
///////////////////////////////////////////////////////////////////////////
/// <summary>
///     Converts a comma-separated list of values to a list of strings.
/// </summary>
/// <param name="csv">a comma-separated list of values</param>
/// <returns>a list of strings</returns>
/// <remarks>compliant with RFC 4180</remarks>
public static IEnumerable<string> wasCSVToEnumerable(string csv)
{
    Stack<char> s = new Stack<char>();
    StringBuilder m = new StringBuilder();
    for (int i = 0; i < csv.Length; ++i)
    {
        switch (csv[i])
        {
            case ',':
                if (s.Count.Equals(0) || !s.Peek().Equals('"'))
                {
                    yield return m.ToString();
                    m = new StringBuilder();
                    continue;
                }
                m.Append(csv[i]);
                continue;
            case '"':
                if (i + 1 < csv.Length && csv[i].Equals(csv[i + 1]))
                {
                    m.Append(csv[i]);
                    ++i;
                    continue;
                }
                if (s.Count.Equals(0) || !s.Peek().Equals(csv[i]))
                {
                    s.Push(csv[i]);
                    continue;
                }
                s.Pop();
                continue;
        }
        m.Append(csv[i]);
    }
 
    yield return m.ToString();
}

###########################################################################
##  Copyright (C) Wizardry and Steamworks 2015 - License: CC BY 2.0      ##
###########################################################################
function wasCSVToArray($csv) {
    $l = array();
    $s = array();
    $m = "";
    for ($i = 0; $i < strlen($csv); ++$i) {
        switch ($csv{$i}) {
            case ',':
                if (sizeof($s) == 0 || !current($s) == '"') {
                    array_push($l, $m);
                    $m = "";
                    break;
                }
                $m .= $csv{$i};
                continue;
            case '"':
                if ($i + 1 < strlen($csv) && $csv{$i} == $csv{$i + 1}) {
                    $m .= $csv{$i};
                    ++$i;
                    break;
                }
                if (sizeof($s) == 0|| !current($s) == $csv[$i]) {
                    array_push($s, $csv{$i});
                    continue;
                }
                array_pop($s);
                break;
            default:
                $m .= $csv{$i};
                break;
        }
    }
    array_push($l, $m);
    return $l;
}

///////////////////////////////////////////////////////////////////////////
//    Copyright (C) 2016 Wizardry and Steamworks - License: CC BY 2.0    //
///////////////////////////////////////////////////////////////////////////
function wasCSVToArray(csv) {
    var l = [];
    var s = [];
    var m = "";
 
    do {
        var a = csv.charAt(0);
        csv = csv.slice(1, csv.length);
        if(a == ",") {
            if(s[s.length-1] != '"') {
                l.push(m);
                m = "";
                continue;
            }
            m += a;
            continue;
        }
        if(a == '"' && csv.charAt(0) == a) {
            m += a;
            csv = csv.slice(1, csv.length);
            continue;
        }
        if(a == '"') {
            if(s[s.length-1] != a) {
                s.push(a);
                continue;
            }
            s.pop();
            continue;
        }
        m += a;
    } while(csv != "");
 
    l.push(m);
 
    return l;
}