Use of wildcard and regex based route constraints in asp.net

FolderController.cs

using System.Collections.Generic;
using Microsoft.AspNetCore.Mvc;
using System.IO;

namespace Asseco.Content.Controllers
{
    [Route("api/v1/content/")]
    public class FolderController : Controller
    {
        private JsonResult GetFileByPath(string repo, string folder, string file)
        {          
            return new JsonResult(new { action = "download", repo = repo, folder=folder, file=file});
        }           
  
        private JsonResult ListFolderContentsByPath(string repo, string folder)
        {       
            return new JsonResult(new { action = "traverse", repo = repo, folder=folder});
        }      

        [HttpGet("{repo}/{*path}")]
        public JsonResult Get(string repo, string path)
        {
            var file = Path.GetFileName(path);
            var folder = Path.GetDirectoryName(path);

            folder = folder.Replace(@"\", @"/").Insert(0, @"/");

            //If there is no extension at the end, assume last path segment is a folder
            if (string.IsNullOrEmpty(Path.GetExtension(path)))
            {
                folder += string.Concat(@"/", file);
                file = "";
            }
            
            //If there is a file in path download file, otherwise list folder contents
            if (!string.IsNullOrEmpty(file))
            {
                return GetFileByPath(repo, folder, file);
            }
            else 
            {
                return ListFolderContentsByPath(repo, folder);
            } 
        }   

        [HttpGet("{repo}/{*path:regex(^(.*)/search$)}")]
        public JsonResult SearchFolderContentsByPath(string repo, string path)
        {
            var folder = path.Replace("/search","");
            return new JsonResult(new { action = "search", repo = repo, folder = folder});
        }            

        [HttpGet("{repo}/{*path:regex(^(.*)/metadata$)}")]
        public JsonResult GetFolderMetadataByPath(string repo, string path)
        {
            var folder = path.Replace("/metadata","");
            return new JsonResult(new { action = "metadata", repo = repo, folder = folder});
        }     
    }
}