[Python] How does the Python "re" module find line endings?

I'm trying to use the Python "re" module with methods "search" and "sub", but without success.

I read a text file having DOS/Windows line endings into a string variable:

import re
with open("filename", 'r') as input:
fileContent = input.read()


Variable "fileContent" looks like this:

"Some text.\r\n\r\nSome more text."


I want to replace some of the line endings with a pipe ("|") symbol:

result = re.sub(r'\n\r\n', '|', fileContent)


A substitution never occurs. It never finds the 0x0a0d0a byte pattern. The same is true using the search method. Same when using the MULTILINE flag. What am I doing wrong?

I tried using "re.search()" to find the pattern without success. I tried expressing the regex pattern as raw text and as a normal string. The method never finds the 3-byte sequence.

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