java.util.regex.PatternSyntaxException: Unclosed character class near index 51
java\.util\.concurrent\.ConcurrentHashMap\$Segment[]
                                                   ^
   at java.util.regex.Pattern.error(Pattern.java:1924)
   at java.util.regex.Pattern.clazz(Pattern.java:2493)
   at java.util.regex.Pattern.sequence(Pattern.java:2030)
   at java.util.regex.Pattern.expr(Pattern.java:1964)
   at java.util.regex.Pattern.compile(Pattern.java:1665)
   at java.util.regex.Pattern.<init>(Pattern.java:1337)
   at java.util.regex.Pattern.compile(Pattern.java:1022)
   at org.netbeans.lib.profiler.heap.ClassDumpSegment.getJavaClassesByRegExp(ClassDumpSegment.java:160)
   at org.netbeans.lib.profiler.heap.HprofHeap.getJavaClassesByRegExp(HprofHeap.java:267)
   at org.netbeans.modules.profiler.heapwalk.ClassesListController.getSubclasses(ClassesListController.java:580)
   at org.netbeans.modules.profiler.heapwalk.ClassesListController.getFilteredSortedClasses(ClassesListController.java:376)
   at org.netbeans.modules.profiler.heapwalk.ClassesListController.getData(ClassesListController.java:161)
   at org.netbeans.modules.profiler.heapwalk.ui.ClassesListControllerUI$17$2.run(ClassesListControllerUI.java:883)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)