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import re
#文本所在TXT文件
file = '123.txt'
#关键字1,2(修改引号间的内容)
w1 = '123'
w2 = '456'
f = open ( file , 'r' )
buff = f.read()
#清除换行符,请取消下一行注释
#buff = buff.replace('\n','')
pat = re. compile (w1 + '(.*?)' + w2,re.S)
result = pat.findall(buff)
print (result)
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