[All] ItemsManager.GetItemCountByNameLua is incorrect

Can't edit original report, but function is also a bit wrong - this works in vanilla/tbc/wrath:
 

public static int GetItemCount(string itemName)
    {
        string countLua =
        $@"
        local fullCount = 0;
        for bag=0,4 do
            for slot=1,36 do
                local itemLink = GetContainerItemLink(bag, slot);
                if (itemLink) then
                    local itemString = string.match(itemLink, ""item[%-?%d:]+"");
                    if(GetItemInfo(itemString) == ""{itemName}"") then
                        local texture, count = GetContaimerItemInfo(bag, slot);
                        fullCount = fullCount + count;
                    end
                end;
            end;
        end
        return fullCount;";
        return Lua.LuaDoString<int>(countLua);
    }

Hello, you get problem with "GetItemCountByNameLUA"? You get problem only on Lua or with tbc and wotlk also?

I get it with GetItemCountByNameLUA and on vanilla + tbc. But I noticed on TBC.

I forgot string.match is not in vanilla, this works across vanilla-wotlk:

public static int GetItemCount(string itemName)
    {
        string countLua =
            $@"
        local fullCount = 0;
        for bag=0,4 do
            for slot=1,36 do
                local itemLink = GetContainerItemLink(bag, slot);
                if (itemLink) then
                    local _,_, itemId = string.find(itemLink, 'item:(%d+):');
                    if (GetItemInfo(itemId) == ""{itemName}"") then
                        local texture, count = GetContainerItemInfo(bag, slot);
                        fullCount = fullCount + count;
                    end
                end
            end
        end
        return fullCount;";
        return Lua.LuaDoString<int>(countLua);
    }