How do you delete a lines within a file where range is determined using regular expressions in python?

I am trying to clean up a series of text files by deleting unneeded lines. I want to delete lines starting with the line that matches Regex1 and keep deleting until the line with Regex2 is found. I need to do this using python. I have already done this using a sed command something like

sed -r '/regex1/,/regex2/d'

and had good luck, but I need something I can run on Windows machines. Plus, I want the whole solution to 开发者_如何学编程be using one language instead of piping between shell and python scripts. Anyone have any ideas or posts to point me to?

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You can do this by using re.DOTALL to make . match newlines:

import re

pattern = re.compile(r"regex1.*?regex2", re.DOTALL)

You can then use pattern.sub("", data) to delete the lines.

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import sys,re

reg_start = 'reg1'
reg_end = 'reg2'

to_print = 1

for line in sys.stdin.readlines():
    if re.search(reg_start, line):
        to_print = 0
    elif re.search(reg_end, line):
        to_print = 1

    if to_print:
        print line,

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In perl there's flip-flop operator that can be use as :

perl -ne "print unless /regex1/ .. /regex2/" file

you could convert this to python as it's explain here