HTTP Service type - multiline Expected Response (Regex) ?

[stfast]

Hi,

I'am trying with multiline (one line works well) Expected Responses for HTTP Service type.

Service Endpoint (URL):

https://mta-sts.google.com/.well-known/mta-sts.txt

where response is:

version: STSv1
mode: enforce
mx: smtp.google.com
mx: aspmx.l.google.com
mx: *.aspmx.l.google.com
max_age: 86400

but none of the valid regex-es do work:

Expected Response (Regex):

^version: STSv1\nmode: enforce\nmx: smtp.google.com\nmx: aspmx.l.google.com\nmx: *.aspmx.l.google.com\nmax_age: 86400$
or

"^version: STSv1\nmode: enforce\nmx: smtp.google.com\nmx: aspmx.l.google.com\nmx: *.aspmx.l.google.com\nmax_age: 86400$"m
...

Always an error:

WARN[13224] Service MTA-STS: google.com.mta-sts Failing: HTTP Response Body did not match '{{^version: STSv1\nmode: enforce\nmx: smtp.google.com\nmx: aspmx.l.google.com\nmx: *.aspmx.l.google.com\nmax_age: 86400$ true}}' | Lookup in: 1369 μs type=service

Could you provide a working example for multiline Expected Response for HTTP Service type

Regards