ofhave.py

import re
import string

from errbot import BotPlugin, botcmd

class ofhave(BotPlugin):

    def callback_message(self, conn, mess):
        reply = self.couldShould(mess.getBody())
        if reply:
            self.send(
                mess.getFrom(),
                reply,
                message_type=mess.getType()
            )

    def couldShould(me, sentence) :
        pronMap = {"i": "you",
                   "you": "you",
                   "they": "they",
                   "we": "you",
                   "he": "he",
                   "she": "she",
                   "it": "it"};
        # (could should would won't can't)
        m = re.search("(I|you|they|we|he|she|it)\s+(could|couldn't|should|shouldn't|would|wouldn't|won't|will not|can't|cannot|can not)(\s+have|'ve)\s+([^-.;,]*)", sentence, re.I);
        if (m) :
            return (pronMap[m.group(1).lower()] + " " + m.group(2) + " of " + m.group(4) + "!");
        return None