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import re
a = 'abc123abv23456'
b = re.findall('23(a)?', a)
print(b)
b = re.findall(r'23(?:a)?', a)
print(b)
import requests,re
url="http://money.163.com/special/pinglun/"
f=requests.get(url).text
req=re.compile("(?<=<div class=\"item_top\">).*?<a href=\"(.*?)\"*?</div>",flags=re.S)
m=req.findall(f)
for i in m:
print(i[1)