如何在字符串索引之前读取文件并删除字符

编辑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)

印刷品:

hello idk about yeah 

^{远离的 \u0008 版本}