Returns the value of the key k from the key-value pair data, or if the variable k is not set or empty the function returns the empty string.

Suppose that the object's description is set to:

data=empty&movement=off

when calling the function with:

wasKeyValueGet("movement", llGetObjectDesc());

the function will return the string "off".

Now suppose that the object's description is set to:

data=empty&movement=off

and we call the function with:

wasKeyValueGet("time", llGetObjectDesc());

the function will return the empty string ("").

///////////////////////////////////////////////////////////////////////////
//    Copyright (C) 2015 Wizardry and Steamworks - License: CC BY 2.0    //
///////////////////////////////////////////////////////////////////////////
string wasKeyValueGet(string k, string data) {
    if(llStringLength(data) == 0) return "";
    if(llStringLength(k) == 0) return "";
    list a = llParseStringKeepNulls(data, ["&", "="], []);
    integer i = llListFindList(llList2ListStrided(a, 0, -1, 2), [ k ]);
    if(i != -1) return llList2String(a, 2*i+1);
    return "";
}

///////////////////////////////////////////////////////////////////////////
//    Copyright (C) 2015 Wizardry and Steamworks - License: CC BY 2.0    //
///////////////////////////////////////////////////////////////////////////
char *wasKeyValueGet(char *key, char *data) {
    if (key != NULL && data != NULL && strcmp(key, "") != 0 && strcmp(data, "") != 0) {
        char *pair, *value;
        data = strdup(data);
        while ((pair = strsep(&data, "&")) != NULL)
            if (strcmp(strtok(pair, "="), key) == 0 && (value = strtok(NULL, "&")) != NULL)
                return value;
    }
    return "";
}

///////////////////////////////////////////////////////////////////////////
//    Copyright (C) 2014 Wizardry and Steamworks - License: CC BY 2.0    //
///////////////////////////////////////////////////////////////////////////
/// <summary>
///     Returns the value of a key from a key-value data string.
/// </summary>
/// <param name="key">the key of the value</param>
/// <param name="data">the key-value data segment</param>
/// <returns>true if the key was found in data</returns>
private static string wasKeyValueGet(string key, string data)
{
    foreach (string tuples in data.Split('&'))
    {
        string[] tuple = tuples.Split('=');
        if (!tuple.Length.Equals(2))
        {
            continue;
        }
        if (tuple[0].Equals(key, StringComparison.Ordinal))
        {
            return tuple[1];
        }
    }
    return string.Empty;
}

###########################################################################
##  Copyright (C) Wizardry and Steamworks 2015 - License: CC BY 2.0      ##
###########################################################################
function wasKeyValueGet($key, $data) {
    return array_reduce(
        explode(
            "&", 
            $data
        ),
        function($o, $p) use($key) {
            return array_reduce(
                    explode(
                        "=",
                        $p
                    ),
                    function($q, $r) use($key) {
                        if($q === $key) return $r;
                    },
                    $key
            ). $o;
        }
    );
}

###########################################################################
##  Copyright (C) Wizardry and Steamworks 2016 - License: CC BY 2.0      ##
###########################################################################
def wasKeyValueGet(key, data):
    try:
        return dict(
            pair.split("=")
                for pair in data.split("&")
            ).get(key, None)
    except:
        return None

///////////////////////////////////////////////////////////////////////////
//    Copyright (C) 2019 Wizardry and Steamworks - License: CC BY 2.0    //
///////////////////////////////////////////////////////////////////////////
function wasKeyValueGet(k, data) {
    if(data.length == 0) return "";
    if(k.length == 0) return "";
    var a = data.split(/&|=/);
    var i = a.filter((e,i) => !(i % 2)).indexOf(k);
    if(i != -1) return a[(2 * i) % a.length + 1];
    return "";
}