def replace_params(text,params,nick,channel):
    openbrackets = 0
    innertext = ""
    result = ""
    for i in range(0,len(text)):
        if text[i] == "[":
            if openbrackets>0:
                innertext += "["
            openbrackets += 1
        elif text[i] == "]" and openbrackets>0:
            openbrackets -= 1
            if openbrackets == 0:
                innertext = replace_params(innertext,params,nick,channel)
                p = innertext.split("|",1)
                m = re.match("(\d+)(\+?)$",p[0])
                if m:
                    q = params[int(m.group(1)):param_end(int(m.group(1)),m.group(2))]
                    if q:
                        result += " ".join(q)
                    elif len(p)==2:
                        result += p[1]
                elif innertext=="USER":
                    result += nick.title()
                elif innertext=="CHANNEL":
                    result += channel.title()
                elif innertext=="CHATTER":
                    result += random_chatter(channel)
                elif innertext=="MOD":
                    result += random_chatter(channel,cats=["moderators","staff","admins"])
                elif innertext.startswith("NOW"):
                    n = re.match("NOW\((.*)\)$")
                    if n:
                        result += datetime.datetime.now().strftime(n.group(1))
                    else:
                        result += "[%s]"%(innertext,)
                elif innertext=="PUN":
                    urlres = urllib2.urlopen(baseurl+"/api/pun")
                    urlresdec = urlres.read().decode("utf-8")
                    jsonres = json.loads(urlresdec)
                    result += replace_params(jsonres["text"],params,nick,channel)
                else:
                    result += "[%s]"%(innertext,)
                innertext = ""
            else:
                innertext += "]"
        elif openbrackets>0:
            innertext += text[i]
        else:
            result += text[i]
    return result