fixed Issue #28 by checking if username contains space before starting connection

fixed Problem "private Messages are visible for sender"

client/src/main/java/ch/zhaw/pm2/multichat/client/ChatWindowController.java

@@ -106,6 +106,7 @@ public class ChatWindowController {
 
     private void startConnectionHandler() throws IOException {
         String userName = userNameField.getText();
+        if(!userName.contains(" ")) {
             String serverAddress = serverAddressField.getText();
             int serverPort = Integer.parseInt(serverPortField.getText());
             connectionHandler = new ClientConnectionHandler(
@@ -118,6 +119,9 @@ public class ChatWindowController {
 
             // register window close handler
             rootPane.getScene().getWindow().addEventHandler(WindowEvent.WINDOW_CLOSE_REQUEST, windowCloseHandler);
+        } else {
+            addError("It is not allowed to have spaces in username!");
+        }
     }
 
     private void terminateConnectionHandler() {

client/src/main/java/ch/zhaw/pm2/multichat/client/ClientConnectionHandler.java

@@ -28,7 +28,7 @@ public class ClientConnectionHandler implements Runnable {
     public static final String USER_NONE = "";
     public static final String USER_ALL = "*";
 
-    private final Pattern messagePattern = Pattern.compile( "^(?:@(\\w*))?\\s*(.*)$" );
+    private final Pattern messagePattern = Pattern.compile( "^(?:@(\\S*))?\\s*(.*)$" );
 
     private SimpleStringProperty userName;
     private SimpleObjectProperty<State> state;
@@ -63,7 +63,6 @@ public class ClientConnectionHandler implements Runnable {
 
     public void setState (State newState) {
         state.set(newState);
-
     }
 
     public void run () {