如何使用python 3从文本文件中找到具有相同正则表达式的重复行[关闭]

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我有一个文本文件a.txt并且只需要从这个文件中获取那些仅以相同的正则表达式duration of system 。 有很多这样的行具有相同的正则表达式duration of system 。 有人能帮我吗？

a.txt

Generating random paragraphs can be an excellent way for writers to get their creative flow going at the beginning of the day. The writer has no idea what topic the random paragraph will be about when it appears. This forces the writer to use creativity to complete one of three common writing challenges. The writer can us

today'sduration of system run1 is 3534535.4545353

way to use this tool to begin a daily writing routine. One way is to generate a random paragraph with the intention to try to rewrite it while still keeping the original meaning. Th

tomorrow'sduration of system run2 is 46355252.25252

nd incorporate a single sentence from that into a new paragraph to create a short story. Unlike the random sentence generator, the sentences from the random paragraph will have so

future'sduration of system run3 is 345354.3535.35

管道分隔格式的程序的预期输出是：

duration of system run1|3534535.4545353

duration of system run2|46355252.25252

duration of system run3|345354.3535.35

Answer 1

这是一种方法

result= re.findall(r'(duration of system run)([\d]*)[\D]*([0-9\.]*)', txt)
result

for i in result:
    print (i[0] + ' ' + i[1] + ' | ' + i[2])

duration of system run 1 | 3534535.4545353
duration of system run 2 | 46355252.25252
duration of system run 3 | 345354.3535.35