[smuxi/stable] Engine: fix parsing IP links with ports on Mono >= 4.1

[Mirco M. M. Bauer <mmmbauer src gnome org>]

commit f3dbc1b36ef26cd53efc1f5ddb29475196080ea5
Author: Mirco Bauer <meebey meebey net>
Date:   Thu Oct 20 01:03:28 2016 +0800

    Engine: fix parsing IP links with ports on Mono >= 4.1
    
    With Mono 4.1 the regex parser was replaced with the open-sourced Microsoft
    implementation. The MS implementation does not treat [0-9]{,4} to mean that a
    number can have between 0 and 4 occurrences.

 src/Engine/Config/MessageBuilderSettings.cs |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/Engine/Config/MessageBuilderSettings.cs b/src/Engine/Config/MessageBuilderSettings.cs
index 0dd15b4..27900f3 100644
--- a/src/Engine/Config/MessageBuilderSettings.cs
+++ b/src/Engine/Config/MessageBuilderSettings.cs
@@ -83,7 +83,7 @@ namespace Smuxi.Engine
             string domain = @"(?:(?:" + subdomain + ")+(?:" + any_tld + ")|localhost)";
             string bare_host = @"[a-z]+";
             string host = "(?:" + domain + "|" + bare_host + "|" + ip + ")";
-            string short_number = "[1-9][0-9]{,4}";
+            string short_number = "[1-9][0-9]{0,4}";
             string port = ":" + short_number;
             string user = "[a-z0-9._%+-]+@";
             string host_port = host + "(?:" + port + ")?";