revert regex related linting

[ysugimoto]

My apologies that Varnish regular expression is not compatible for Golang's regexp package.

It causes:

if (req.url ~ "^/([^\?]*)?(\?.*)?$") {
...
}

Then raises [ERROR] regex string is invalid, error parsing regexp: invalid or unsupported Perl syntax: (?.
I assume that VCL regular expression is using Perl syntax but Golang does not have it... so I revert these changes 😢

[ysugimoto]

Temporary revert this change. I guess it may fix by escaping back-slash.
"^/([^\?]*)?(\?.*)?$" does not seem Perl syntax, just matches ? character 🤔

[smaeda-ks]

I think you're right. Can regexp.QuoteMeta help here?
https://pkg.go.dev/regexp#QuoteMeta

[ysugimoto]

Thanks, I think that function also escapes other meta characters like [.
Simply we can replace escape back-slack like strings.ReplaceAll(regexString, "\\", "\\\\").

[smaeda-ks]

Ah, I misunderstood the point. Sounds good.