Fix 16071 --- FSharp.DependencyManager.Nuget ignoring sources (#16991)

* Fix 16071

* tweaks

* Automated command ran: fantomas

  Co-authored-by: KevinRansom <5175830+KevinRansom@users.noreply.github.com>

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Petr <psfinaki@users.noreply.github.com>

Author: 3 people

src/FSharp.DependencyManager.Nuget/FSharp.DependencyManager.Utilities.fs

@@ -320,10 +320,9 @@ module internal Utilities =
             //      https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet5/nuget/v3/index.json
             // Use enabled feeds only (see NuGet.Commands.ListSourceRunner.Run) and strip off the flags.
             let pattern =
-                @"(\s*\d+\.+\s*)(?'name'\S*)(\s*)\[(?'enabled'Enabled|Disabled)\](\s*)$(\s*)(?'uri'\S*)"
+                @"(\s*\d+\.+\s*)(?'name'\S*)(\s*)\[(?'enabled'Enabled|Disabled)\](\s*)(?'uri'[^\0\r\n]*)"
 
-            let regex =
-                new Regex(pattern, RegexOptions.Multiline ||| RegexOptions.ExplicitCapture)
+            let regex = new Regex(pattern, RegexOptions.ExplicitCapture)
 
             let sourcelist = String.concat Environment.NewLine stdOut