how to read file and remove character before string index-CodePudding

I have a text file that has the following:

hello haha [BS][BS][BS][BS]idk about that [BS][BS][BS][BS]yeah no[BS][BS]

I would like to read it and essentially re save it to a new file or just replace the old file using the [BS] as a backspace. so it would then be...

hello idk about yeah

Messed around with a bunch of alternatives like .pop() and .replace() no luck unfortunately.

CodePudding user response：

EDIT 2:

import re

s = "hello haha [BS][BS][BS][BS]idk about that [BS][BS][BS][BS]yeah no[BS][BS]"

out, i = "", 0
for m in re.finditer(r"(\s*\[BS\]) ", s):
    c = m.group(0).count("[BS]")
    out  = s[i : max(m.start() - c, 0)]
    i = m.end()
out  = s[i:]

print(out)

Prints:

hello idk about yeah

^{Removed \u0008 version}

CodePudding user response：

this is not the most efficient solution (like that), and i'm not sure how you suppose to handle spaces (your description is quite ambiguous - note the comment to your question):

from re import sub

s = "hello haha [BS][BS][BS][BS]idk about that [BS][BS][BS][BS]yeah no[BS][BS]"

while '[BS]' in s:
    s = sub(r'.?\[BS\]', '', s, count=1)

>>> s
'''
'hello hidk about tyeah '