use visual studio templates to rename part of a class and file name

Question

I want to be able to rename classes using dotnet new project templates like these examples

I want to have files/classes that have the same name as the project with a suffix that automatically rename to match the project

eg [projectname]DbContext, ProjectNameDto so if my template is called MyWebTemplate and it has a class MyWebTempaleDbContext and the user picks a name Of MyWebApp the file and class would be renamed to MyWebAppDbContext.

I am able to do this with parameters, but want to do this for multiple classes and dont want to have to add a parameter for this

here is how it can be done with parameters :

"DBContextName": {
  "type": "parameter",
  "defaultValue": "WebApplicationDbContext",
  "replaces": "WebApplicationDbContext", 
  "FileRename": "WebApplicationDbContext",
  "datatype": "text",
  "description": "Db Context Name"
},

Is there a way to do this using RegEx or regex match?

The example they give is :

"symbols": {
  "regexExample": {
    "type": "generated",
    "generator": "regex",
    "dataType": "string",
    "replaces": "A different message",  //The value to replace in the output
    "parameters": {
      "source": "message",              //The name of the symbol whose value should be operated on
      "steps": [
        {
          "regex": "^test",             //The regular expression whose matches will be replaced with '[Replaced]`
          "replacement": "[Replaced]"   //The value to replace matches of the expression '^test' with
        },
        {
          "regex": "test$",
          "replacement": "[/Replaced]"
        }
      ]
    }
  }
}

I also found a file rename example but cant seem to work out how to make the 2 do what i want:

    {
...
  "symbols": {
    "app1Rename": {
      "type": "derived",  
      "valueSource": "name",  
      "valueTransform": "ValueAfterLastDot",  
      "fileRename": "Application1",  
      "description": "A value derived from the 'name' param, used to rename Application1.cs"
    }
  }
...
  "forms": {
    "ValueAfterLastDot": {
      "identifier": "replace",
      "pattern": "^.*\\.(?=[^\\.]+$)",        // regex to match everything up to and including the final "."
      "replacement": ""  // replace it with empty string
    }
  }
...
}

Thanks