python 提取红楼梦第一章得到五言律诗和七言律诗（正则表达式）

import requests
from re import findall

# (1|2)[0-9][0-9][0-9]-(0[1-9]|1[012]|[1-12])-(0[1-9]|1[0-9]|2[0-9]|3[01]|[1-31])

string = requests.get('https://www.xyyuedu.com/gdmz/sidamingzhu/hlmeng/21651.html') \
    .text.encode("ISO-8859-1").decode('gbk').encode('utf8').decode('utf8')
strings = findall(r'<p>((?:.|\n)*?)</p>', string)
str1 = str(strings)
str1 = findall(r'(?<=\S)*[\u4e00-\u9fa5]+[?。,:\-;]*(?=\S)*', str1)
str2 = "".join(str1)
str2 = "".join(str2.split())
print(str2) #string是网页内容字符串

five = r'[\u4e00-\u9fa5]{5}[,?][\u4e00-\u9fa5]{5}[,?。][\u4e00-\u9fa5]{5}[,?。][\u4e00-\u9fa5]{5}[?。]'
fiveCharacter = findall(five, str2)
print(fiveCharacter)

seven = r'[\u4e00-\u9fa5]{7}[,?][\u4e00-\u9fa5]{7}[,?。][\u4e00-\u9fa5]{7}[,?。][\u4e00-\u9fa5]{7}[?。]'
sevenCharacter = findall(seven, str2)
print(sevenCharacter)