Use value from expression to match specific data

[bhoppeadoy]

Is it possible to capture a value from the expression and use that to return specific data? Like a regex capture?

For example, I have this simple mock that returns an array of data that's contained in a file
"expression": "api/solutions"
"response": {
"file": "data/solutions-list.json"
}

Each item in the array has a GUID associated with it. This GUID is used in other API calls, for example this returns an svg for that specific GUID:
api/solutions/([0-9A-Fa-f]{8}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{12})/svg

I'd like to be able to mock it so that the correct svg file is returned based on the GUID in the expression. For example, I could have the response for a file:
"expression": "api/solutions/([0-9A-Fa-f]{8}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{12})/svg"
"response":{
"file": "data/%GUID%.svg"
}

Where %GUID% is the captured GUID from the expression.

Is this possible or is there another way I missed that I can do this?