python - DeprecationWarning: invalid escape sequence - what to use instead of d?

Question

I've met a problem with re module in Python 3.6.5. I have this pattern in my regular expression:

'\nRevision: (d+)\n'

But when I run it, I'm getting a DeprecationWarning.

I searched for the problem on SO, and haven't found the answer, actually - what should I use instead of d+? Just [0-9]+ or maybe something else?

Answer 1

Python 3 interprets string literals as Unicode strings, and therefore your d is treated as an escaped Unicode character.

Declare your RegEx pattern as a raw string instead by prepending r, as below:

r'
Revision: (d+)
'

This also means you can drop the escapes for as well since these will just be parsed as newline characters by re.