account for prerelease label having - wherever and having digits

Author: anamnavi

src/code/LocalServerApiCalls.cs

@@ -260,7 +260,7 @@ private FindResults FindNameHelper(string packageName, string[] tags, bool inclu
             string actualPkgName = packageName;
 
             // this regex pattern matches packageName followed by a version (4 digit or 3 with prerelease word)
-            string regexPattern = $"{packageName}" + @".\d+\.\d+\.\d+(?:-[a-zA-Z0-9]+|.\d)?.nupkg";
+            string regexPattern = $"{packageName}" + @".\d+\.\d+\.\d+(?:[a-zA-Z0-9-.]+|.\d)?.nupkg";
             Regex rx = new Regex(regexPattern, RegexOptions.Compiled | RegexOptions.IgnoreCase);
             _cmdletPassedIn.WriteDebug($"package file name pattern to be searched for is: {regexPattern}");