Use or raw string on regular expressions

[Zaya_pool]

I am studying regular expressions in an introduction course and I don't completely understand the use of raw strings. I will ilustrate my question with the most basic example:

import re

text = "This is a text with a dot."
pattern = r"\."
match = re.findall(pattern, text)

print(match)

The use of '"r'' before the regular expresion "\." should impede the escape of the backslash before the ".", therefore searching for any character except a newline (use of ''.'' in regular expressions), but it doesn't; The expression is still interpreted as a escape, searching for the caracter ''.''.
Getting the same result that not using "r" before the regular expresion, Im confused of the use of "r".

Note: in other types of escapes as ''\n'', it does work as expected, impeding the escape and searching for the literal string "\n"