1 files changed, 12 insertions, 0 deletions
diff --git a/src/org/traccar/helper/PatternBuilder.java b/src/org/traccar/helper/PatternBuilder.java
index e8f5c605a..0105bf7a6 100644
--- a/src/org/traccar/helper/PatternBuilder.java
+++ b/src/org/traccar/helper/PatternBuilder.java
@@ -21,6 +21,10 @@ public class PatternBuilder {
 
     private final StringBuilder pattern = new StringBuilder();
 
+    public interface Builder {
+        void build(PatternBuilder builder);
+    }
+
     public PatternBuilder xpr(String s) {
         pattern.append(s);
         return this;
@@ -60,6 +64,14 @@ public class PatternBuilder {
         return not(s).txt(s);
     }
 
+    public PatternBuilder groupBegin() {
+        return xpr("(?:");
+    }
+
+    public PatternBuilder groupEnd(boolean optional) {
+        return xpr(optional ? ")?" : ")");
+    }
+
     public Pattern compile() {
         return Pattern.compile(pattern.toString(), Pattern.DOTALL);
     }