private Matcher getClassNameRegex(String propertySuffix) {
   String regex = System.getProperty("jmockit-coverage-" + propertySuffix, "");
   return regex.length() == 0 ? null : Pattern.compile(regex).matcher("");
 }
 ClassSelection() {
   classesToInclude = getClassNameRegex("classes");
   classesToExclude = getClassNameRegex("excludes");
   testCode = Startup.isTestRun() ? Pattern.compile(".+Test(\\$.+)?").matcher("") : null;
 }