Replace function by regex - invalid escape character: \d

[itayvolo]

Hey,
I'm trying to run the replace function within a remap transform, here's my config:

transforms:
  remove_fields:
    type: remap
    inputs: ["file"]
    source: |-
      if contains(.message, "stderr F ") {
          .message = replace(.message, "r'\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{1,}Z' stderr F ", "")
      }
      if contains(.message, "stdout F ") {
          .message = replace(.message, "r'\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{1,}Z' stdout F ", "")
      }
      if contains(.message, "r'\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{1,}Z' ") {
          .message = replace(.message, r'\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{1,}Z)', "")
      }

I've read that it is possible to run the function with regex according to the docs here: https://vector.dev/docs/reference/vrl/functions/#replace

But still I get this error:

22 │ │ .message = replace(.message, r'\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}.\d{1,}Z)', "")
23 │ │ }
│ ╰─^ unexpected error: invalid escape character: \d

Any idea what's wrong here?

I tried to use double backslash and using parentheses instead of braces but nothing works, I get the same error of invalid escape character all the time..
Please help :)