VALUEERRORが直せない

紹介されている通りにやっているのにエラーが出てしまいます。
どうすればよいでしょうか。

import random
import re
from analyzer import *


class Dictionary:
    def __init__(self):
        self.random = []
        rfile = open('random.txt', 'r', encoding = 'utf_8')
        r_lines = rfile.readlines()
        rfile.close()

        self.random = []
        for line in r_lines:
            str = line.rstrip('\n')
            if (str!=''):
                self.random.append(str)

        pfile = open('pattern.txt', 'r', encoding = 'utf_8')
        p_lines = pfile.readlines()
        pfile.close()
        self.new_lines = []
        for line in p_lines:
            str = line.rstrip('\n')
            if (str!=''):
                self.new_lines.append(str)

        self.pattern = []

        for line in self.new_lines:
            ptn, prs = line.split('\t')
            self.pattern.append(ParseItem(ptn, prs))

    def study(self, input, parts):
        input = input.rstrip('\n')
        self.study_random(input)
        self.study_pattern(input, parts)


    def study_random(self, input):
        if not input in self.random:
            self.random.append(input)

    def study_pattern(self, input, parts):
        for word, part in parts:
            if (keyword_check(part)):
                depend = False
                for ptn_item in self.pattern:
                    m = re.search(ptn_item.pattern, word)
                    if(re.search(ptn_item.pattern, word)):
                        depend = ptn_item
                        break
                if depend:
                    depend.add_phrase(input)
                else:
                    self.pattern.append(ParseItem(word, input))      

    def save(self):
        for index, element in enumerate(self.random):
            self.random[index] = element +'\n'
        with open('random.txt', 'w', encoding = 'utf_8') as f:
            f.writelines(self.random)

        pattern = []
        for ptn_item in self.pattern:
            pattern.append(ptn_item.make_line() + '\n')
        with open('pattern.txt', 'w', encoding = 'utf_8') as f:
            f.writelines(pattern)

class ParseItem:
    SEPARATOR = '^((-?\d+)##)?(.*)$'

    def __init__(self, pattern, phrases):
        m = re.findall(ParseItem.SEPARATOR, pattern)
        self.modify = 0
        if m[0][1]:
            self.modify =int(m[0][1])
            self.pattern = m[0][2]

            self.phrases = []
            self.dic = {}
            for phrase in phrases.split('|'):
                m = re.findall(ParseItem.SEPARATOR, phrase)
                self.dic['need'] = 0
                if m[0][1]:
                    self.dic['need'] = int(m[0][2])
                self.dic['phrase'] = m[0][2]
                self.phrases.append(self.dic.copy())


    def match(self, str):
        return re.search(self.pattern, str)

    def choice(self, mood):
        choices = []
        for p in self.phrases:
            if (self.suitable(p['need'], mood)):
                choices.append(p['phrase'])
        if (len(choices) == 0):
                return None
        return random.choice(choices)

    def suitable(self, need, mood):
        if (need == 0):
            return True
        elif (need > 0):
            return (mood > need)
        else:
            return (mood < need)

    def add_phrase(self, phrase):
        for p in self.phrases:
            if p['phrase'] == phrase:
                return
        self.phrases.append({'need': 0, 'phrase': phrase})

    def make_line(self):
        pattern = str(self.modify) + '##' + self.pattern
        phrases= []
        for p in self.phrases:
            phrases.append(str(p['need']) + '##' + str(p['phrase']))
        return pattern + '\t' + '|'.join(phrases)

Python

  File "C:\Users\ssato\AppData\Local\Programs\Python\Python37-32\PtnaForm.py", line 11, in <module>
    ptna = Ptna('ptna')
  File "C:\Users\ssato\AppData\Local\Programs\Python\Python37-32\ptna.py", line 8, in __init__
    self.dictionary = Dictionary()
  File "C:\Users\ssato\AppData\Local\Programs\Python\Python37-32\dictionary_one.py", line 31, in __init__
    ptn, prs = line.split('\t')
ValueError: not enough values to unpack (expected 2, got 1)
>>> 

pattern.txt
こんち(は|わ)$    こんにちは|やほー|ちわす|ども|またあんた？
おはよう|おはよー|オハヨウ    おはよ！|まだ眠い…|さっき寝たばかりだよ
こんばん(は|わ)    こんばんは|おばんですね|今何時？
^(お|うい)す$    うぃっす
^やあ[、。！]*$    やっほー
バイバイ|ばいばい    ばいばい|バイバーイ|ごきげんよう
^じゃあ?ね?$|またね    またねー|じゃあまたね|また遊んでね
^どれ[？?]$    アレはアレ|今手に持ってるものだよ|それだよー
^[し知]ら[なね]    やばいー|知らなきゃまずいじゃん|知らないの？
-2##おまえ|あんた|お前|てめー[TAB]-5##%match%じゃないよ!
-5##ばか|バカ|馬鹿    そんなこと言わないでよ|%match%じゃないもん！|%match%っていうやつが%match%なんだよ|ぷんすか！

出典は秀和システム出版の「Pythonパーフェクトマスター」です。