我有三个文件，main.txt，out.txt和in.txt. 我想用 的内容替换每次出现的out.txtinmain.txt内容in.txt。
和out.txt都in.txt可以包含多行和各种特殊字符。如何正确读取和转义这些字符串？
这是一个包含一些边缘情况的示例，例如特殊字符、重复匹配、不完整匹配、重叠匹配。
main.txt:
foo
Replace these
three lines
with some $.*\'"& in it
bar
Replace these
three lines
with some $.*\'"& in it
Replace these
three lines
with some $.*\'"& in it
three lines
Replace these
three lines
three lines
with some $.*\'"& in it
baz
out.txt:
Replace these
three lines
with some $.*\'"& in it
in.txt:
Replacement …