diff --git a/src/main/java/ch/eitchnet/utils/helper/StringHelper.java b/src/main/java/ch/eitchnet/utils/helper/StringHelper.java
index db43eb557..4a8bc83aa 100644
--- a/src/main/java/ch/eitchnet/utils/helper/StringHelper.java
+++ b/src/main/java/ch/eitchnet/utils/helper/StringHelper.java
@@ -38,6 +38,8 @@ public class StringHelper {
 	public static final String SPACE = " "; //$NON-NLS-1$
 	public static final String NULL = "null"; //$NON-NLS-1$
 	public static final String DASH = "-"; //$NON-NLS-1$
+	public static final String UNDERLINE = "_"; //$NON-NLS-1$
+	public static final String COMMA = ","; //$NON-NLS-1$
 
 	private static final Logger logger = LoggerFactory.getLogger(StringHelper.class);