Added ability to find builder-groups

tools/gardening/lib/src/util.dart

Index: tools/gardening/lib/src/util.dart
diff --git a/tools/gardening/lib/src/util.dart b/tools/gardening/lib/src/util.dart
index ba80e6e6372bec8609051e3cf99dc7977762461b..2e48792829e170eda60e0be46ad68182c7c6362a 100644
--- a/tools/gardening/lib/src/util.dart
+++ b/tools/gardening/lib/src/util.dart
@@ -105,3 +105,12 @@ void processArgResults(ArgResults argResults) {
     cache.base = null;
   }
 }
+
+/// Strips un-wanted characters from string [category] from CBE json.
+String sanitizeCategory(String category) {
+  // Category name starts with either two or three numbers and
+  // end with |all. Instead of doing any fancy regular-expr,
+  // we just test if third char is a number.
+  return category.substring(
+      category.codeUnitAt(2) <= 64 ? 3 : 2, category.length - 4);
+}