Terraform GCP Unsupported escape sequence in regex - regex

Question

I am trying to set up custom metrics in GCP using terraform code.
I have a problem with the label extractor part to get 4xx and 5xx response codes.
Basing on console response and Google builder I managed to create this regex:
\\s([4-5][0-9][0-9])\\s\
When I run code with this regex I get this response:
googleapi: Error 400: Failed to parse extractor expression:
unsupported escape sequence in a string literal at line 1, column 36,
token '"\s([1-5][0-9][0-9])\s"'
When I send regex without white spaces (\\s) code works flawlessly.
I have tried different variations of \ before "\ parts, but none seemed to work.
extracted_label = "REGEXP_EXTRACT(jsonPayload.message, \"\\s([1-5][0-9][0-9])\\s\")"
I would like to be able to create a metric, but I cannot bypass the unsupported escape sequence problem.
I would be grateful for any help.

Answer 1

I managed to find answer by myself to this question.
The correct way is using 4 slashes \\\\
Fixed code line should look like this:
extracted_label = "REGEXP_EXTRACT(jsonPayload.message, \"\\\\s([4-5][0-9][0-9])\\\\s\")"
Also, if someone would look for sample code in Terraform GCP to pull HTTP response code from readiness health check here is one:
extracted_label = "REGEXP_EXTRACT(jsonPayload.message, \"\\\\w+\\\\/\\\\d\\\\.\\\\d\\\"\\\\s([4-5][0-9][0-9])\")"