无法弄清楚在我的代码中放置“ \\ n”的位置，以便正则表达式逐行打印。

Question

So I have been at this for a while now trying to figure out where to put the '\\n' in order for the output being set into a text document to be placed line by line. It is grouping the output into one big mess. I wanted for each line that matches my regex, to be saved on a seperate line.

Code:

import re


dns = []
with open('ns.txt', 'r') as file:
    lines = file.read().splitlines()
    for line in lines:
        if re.search(r'^(add lb vserver )(\S+) (\S+) (\S+)(.+)$', "line"):
            dns.append(line)
            print(dns)
    with open('dnsout.txt', 'w') as f:
        f.writelines(lines)

Answer 1

dns.append(line)必须是dns.append(line+"\\n") 。

Answer 2

updated (sorry for typo's)

Since you're reading in all the lines into an array anyway.
Just read the entire file into a string.

Then clean it up with a find (?m)$(?:\\s*\\r?\\n)+ replace \\r\\n

Use whatever CRLF translation your system uses.
This just removes all extra linebreaks.

If you want to make it with an extra line separation, make the replacement \\r\\n\\r\\n .