Is the r before the pattern definition useful?

Question

I tried without and it works too so.. what does it change?

Answer 1

Building re patterns you often need \.

These are used for escape characters like \n in regular strings.

So taking a raw string saves you from having to write too many \\.

Answer 2

Oh ok so when we put a r before, all the "specials" characters are disabled?

Answer 3

Exactly.