How to read a dynamically generated file using regular expression

Try this:

function findFiles() {  
  var foundFiles, aFile;
  foundFiles = aqFileSystem.FindFiles("C:\\Exported_Data", "Output*.csv");
  if (!strictEqual(foundFiles, null)) {
    while (foundFiles.HasNext()) {
      aFile = foundFiles.Next();
      Log.Message(aFile.Name);
    }
  }
  else {
    Log.Message("No files were found.");
  }
}

Hi Sravani93 

If the directory will only have one file then you could use aqFIleSystem.FindFiles function to get the path to that one file. Something like this:

var pathToDirectory = "c:\\";
var searchPattern = "*.txt";
var files = aqFileSystem.FindFiles(pathToDirectory , searchPattern, false);
var file = file.Next();
var path = file.Path;

If there will be more than one file in that directory then you could try a couple of different things. 

1. Get the list of files before and after running your test. Then compare the lists to find the new file.  

2. If each test creates a new file then you could just get the most recent file:  The code below comes from this post: Solved: Re: How to Validate recently downloaded output Exc... - SmartBear Community

    function getMostRecentCreatedFile(directoryPath, searchPattern)
    {
      var newestFilePath = "";
      var previousCreationTime = "1/1/1900";
      try
      {
        var files = aqFileSystem.FindFiles(directoryPath, searchPattern, false);
        if (files != null)
        {         
          while(files.HasNext())
          {
            var file = files.Next();
            var creationTime = aqFile.GetCreationTime(file.Path);
            if (aqDateTime.Compare(creationTime, previousCreationTime) == 1)
            {
              previousCreationTime = creationTime;
              newestFilePath = file.Path;
            }
          }
        }
      }
      catch(e)
      {
        Log.Error("Exception in getMostRecentCreatedFile", e.descrpition);
      }
      //
      return newestFilePath;
    }

    function testGetFile()
    {
      var filePath=getMostRecentCreatedFile("C:\\Users\\herrerae\\Downloads", "*.xlsx");
    }