In my API I have a set of regex patterns that I use throughout the document 
for the "pattern" field. I want to make some sort of a constant values that 
I can re-use instead of having a bunch of copies of the same regex pattern. 
This is for readability and to reduce the locations that have to be updated 
if the regex is changed.

I've tried a few things. The most recent was to define an extension as 
shown below. The example shows two ways that I tried to do it. The first 
was just direct properties with values and the last one, "objected" was by 
creating an extension called "x-val" so that I could specify the type as 
"string.

Is there a way to do what I am trying to do with Swagger 2.0?

x-formatting:
  username: "/^[A-Z0-9][A-Z0-9-]+[A-Z0-9]$/i"
  targetname: "/^[A-Z0-9\\-\\._]+$/i"
  groupname: "/^[A-Z0-9][A-Z0-9-]+[A-Z0-9]$/i"
  email: "/^[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,20}$/i"
  objectid:
    type: string
    x-val: "/^[0-9a-fA-F]{24}$/"

... and here are the attempted references

pattern: 
    $ref: "#/x-formatting/username"

pattern: 
    $ref: "#/x-formatting/objectid/x-val"

The error I am getting is that the pattern field is expecting a "string"

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