Giving absolute URL path on server while publishing on FTP

So you want to make a list of absolute URLs, like:

ftp://example.com/LeadImage/Pending/file1.jpg
ftp://example.com/LeadImage/Pending/file2.jpg
ftp://example.com/LeadImage/Pending/file3.jpg

??

using System.Linq;
using System.Text.RegularExpressions;

string[] files = Directory.GetFiles(@"\LeadImage\Pending\", "*.jpg", SearchOption.AllDirectories);
var URLs = from file in files
           let f = file.Replace(@"\", "/")  // convert backslashes to forward slashes
           select Regex.Replace(f, @"(^.+)(/LeadImage/Pending/.+)$)", "ftp://example.com$2");  // strip all but subdirectory/file and rewrite as URL