Python正则表达式findall输出到文件中

Question

我有一个包含许多五位数字id的javascript代码输入文件。我想将这些id放在一个列表中，例如：

53231,53891,72829等

这是我的实际Python文件：

import re

fobj = open("input.txt", "r")
text = fobj.read()

output = re.findall(r'[0-9][0-9][0-9][0-9][0-9]' ,text)

outp = open("output.txt", "w")

我该如何按照自己的要求在输出文件中获取这些id呢？

谢谢。

- Florian

Answer 1

import re
# Use "with" so the file will automatically be closed
with open("input.txt", "r") as fobj:
    text = fobj.read()
# Use word boundary anchors (\b) so only five-digit numbers are matched.
# Otherwise, 123456 would also be matched (and the match result would be 12345)!
output = re.findall(r'\b\d{5}\b', text)
# Join the matches together
out_str = ",".join(output)
# Write them to a file, again using "with" so the file will be closed.
with open("output.txt", "w") as outp:
    outp.write(out_str)

- Tim Pietzcker

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@Florian 如果这个答案解决了你的问题，请考虑接受这个答案（在投票计数下面的 V 标记）。 - mdeous