Plese add regular expression functionality for specifying upstreams for domains

[kaitongchow]

Prerequisites

• I have checked the Wiki and Discussions and found no answer

• I have searched other issues and found no duplicates

• I want to request a feature or enhancement and not ask a question

The problem

In specifying upstreams for domains, there is no ability to set specify DNS for URLs containing specific strings, which also results in the need to add many domain names and affects the running speed.
for example，I need to list cdn.host.com, a.hostcdn.top, b.cdn.com, and so on separately to specify DNS, and cannot use regular expressions:[\wcdn\w.\w*] to simple setup.

Proposed solution

I hope to add the functionality of regular expressions, which can greatly reduce the number of domain names that need to be specified for DNS, increase convenience and running speed.
thank you~

Alternatives considered and additional information

At present, DNS custom filtering rules have added the function of regular expressions to block domain names. Can they also be ported to [specifying upstreams for domains]?
thank you~