代码

import re

string1 = """The Euro STOXX 600 index, which tracks all stock markets across Europe including the F
         TSE, fell by 11.48% – the worst day since it launched in 1998. The panic 1334 selling prompted by the coronavirus has wiped £2.7tn off the value of STOXX 600 shares since its all-time peak on 
         19 February."""

s8=re.search(r".+\s(.+ex).+\s(\d\d\s.+).",string1)

s8.groups()

print(s8)

预计将打印（“索引”，“2月19日”）

错误

s8.groups()
    ^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'groups'

有谁能告诉我为什么会出现这个错误吗？