Platform specific regex pattern question

Hello! I'm wondering about something and would like to ask some help/verification.
So, in the client there is a regex pattern which validates against errors caused by untrusted certificates. https://github.com/hashicorp/go-retryablehttp/blob/40b0cad1633fd521cee5884724fcf03d039aaf3f/client.go#L86

However, in the Go source code I see the following
```go
macosErr: "x509: “valid.testing.golang.invalid” certificate is not trusted",
windowsErr: "x509: certificate signed by unknown authority",
```
[source](https://github.com/golang/go/blob/aeac0b6cbfb42bc9c9301913a191bb09454d316a/src/crypto/x509/platform_test.go#L171)
Does this mean there should be a different, platform specific regex pattern for Windows?