Regexes are not added to the usage site instead of the schema declaration

[WilliamABradley]

Current:

const UserId = z.string();
const User = z.object({
    _id: UserId.regex(/^user_[a-z0-9]{25,27}$/),
    full_name: z.string().optional(),
    email: z.string().optional(),
});

Expected:

const UserId = z.string().regex(/^user_[a-z0-9]{25,27}$/);
const User = z.object({
    _id: UserId,
    full_name: z.string().optional(),
    email: z.string().optional(),
});

Spec:

"UserId": {
  "type": "string",
  "format": "cuid",
  "pattern": "^user_[a-z0-9]{25,27}$"
},
"User": {
  "type": "object",
  "properties": {
    "_id": {
      "$ref": "#/components/schemas/UserId"
    },
    "full_name": {
      "type": "string"
    },
    "email": {
      "type": "string"
    }
  },
  "required": [
    "_id"
  ]
},

This is a problem if we want to pick out and validate UserId on it's own.