Can Xray routing rules use wildcard patterns for user email prefixes?

[mehdikhody]

I'm configuring routing rules in Xray and need clarification on the user field in the RuleObject as described in the Xray routing documentation.

The documentation states:

user: [string]

An array where each item represents an email address. This rule will take effect when the source user matches any of the email addresses in the array.

I have users in my 443 inbound with email identifiers such as de-user1, uk-user1, de-user2, and uk-user2. My goal is to route users with a de prefix to a DE outbound and those with a uk prefix to a UK outbound.

Is it possible to use wildcard patterns (e.g., de-* or uk-*) in the user field to match these prefixes? For example, would the following routing rules work as intended?

{
  "rules": [
    {
      "outboundTag": "DE",
      "inboundTag": ["inbound-0.0.0.0:443"],
      "user": ["de-*"]
    },
    {
      "outboundTag": "UK",
      "inboundTag": ["inbound-0.0.0.0:443"],
      "user": ["uk-*"]
    }
  ]
}

If wildcards are not supported, what’s the best way to achieve this routing based on user email prefixes? Would I need to list every user explicitly or is there another approach, such as regex or a different rule type?

Thanks for any insights or examples!