re.match匹配多行数据失败

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import requests
try:
import cookielib
except:
import http.cookiejar as cookielib
import re
session = requests.session()
header = {
"HOST": "www.zhihu.com",
"Referer": "https://www.zhihu.com/",
"User-Agent": "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:56.0) Gecko/20100101 Firefox/56.0"
}
def get_xsrf():
r = session.get("https://www.zhihu.com", headers=header)
# print(r.text)
text1 = '<input type="hidden" name="_xsrf" value="5986f7d0c7314107a47024ef01fedcc8"/>'
text = 'xxxn<input type="hidden" name="_xsrf" value="5986f7d0c7314107a47024ef01fedcc8"/>'
match_obj = re.match('.*name="_xsrf" value="(.*?)"', text, re.DOTALL)
if match_obj:
print(match_obj.group(1))
else:
print("None")
get_xsrf()