Checkstyle rules : 'Header' and 'RegexpHeader' are not available in Sonar

The rule Header should be activated on the profile "sonar on sonar" on nemo, in order to check the license/copyright header. The parameter "header" has the following value :

/*\n * Sonar, open source software quality management tool.\n * Copyright (C) 2009 SonarSource SA\n * contact AT sonarsource DOT com\n *\n * Sonar is free software; you can redistribute it and/or\n * modify it under the terms of the GNU Lesser General Public\n * License as published by the Free Software Foundation; either\n * version 3 of the License, or (at your option) any later version.\n *\n * Sonar is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU\n * Lesser General Public License for more details.\n *\n * You should have received a copy of the GNU Lesser General Public\n * License along with Sonar; if not, write to the Free Software\n * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02\n */

with a high priority...

Looks like there is no way to specify a header with carriage return characters as those characters are ignored by Sonar. see screenshot.

Ok, I didn't read the tip :

the required header specified inline. Individual header lines must be separated by the string "\n" (even on platforms with a different line separator)