diff --git a/src/fr/devinsy/logar/app/Logar.java b/src/fr/devinsy/logar/app/Logar.java
index fc7774b..160d815 100644
--- a/src/fr/devinsy/logar/app/Logar.java
+++ b/src/fr/devinsy/logar/app/Logar.java
@@ -47,7 +47,7 @@ public final class Logar
 {
     private static Logger logger = LoggerFactory.getLogger(Logar.class);
 
-    public static String LOGFILE_PATTERN = "^.+\\.(log|log\\.\\d+|log\\.gz|log\\.gz\\.\\d+)";
+    public static String LOGFILE_PATTERN = "^.+(\\.|_)(log|log\\.gz|log\\.\\d+|log\\.\\d+\\.gz)$";
 
     /**
      * Instantiates a new log tool.
@@ -93,7 +93,7 @@ public final class Logar
             anonymizer.loadMapTable(mapFile);
             System.out.println("Table size=" + anonymizer.getMapTable().size());
 
-            Files files = FilesUtils.searchEndingWith(source, ".log", ".log.gz").keepFileType().removeContaining("-anon.log");
+            Files files = FilesUtils.searchEndingWith(source, ".log", ".log.gz").keepFileType().removeContaining("-anon.log").sortByName();
             logger.info("file count={}", files.size());
             for (File file : files)
             {
@@ -501,7 +501,7 @@ public final class Logar
      */
     public static void testConcate(final File source)
     {
-        Files files = FilesUtils.searchEndingWith(source, ".log", ".log.gz").keepFileType().removeContaining("-anon.log");
+        Files files = FilesUtils.searchEndingWith(source, ".log", ".log.gz").keepFileType().removeContaining("-anon.log").sortByName();
 
         for (File file : files)
         {