diff --git a/inc/CalDAVRequest.php b/inc/CalDAVRequest.php
index 8cd33f7b..d728743c 100644
--- a/inc/CalDAVRequest.php
+++ b/inc/CalDAVRequest.php
@@ -220,6 +220,16 @@ class CalDAVRequest
     return $this->depth;
   }
 
+  /**
+  * Returns the tail of a Regex appropriate for this Depth, when appended to
+  *
+  */
+  function DepthRegexTail( ) {
+    if ( $this->IsInfiniteDepth() ) return '';
+    if ( $this->depth == 0 ) return '$';
+    return '[^/]*/?$';
+  }
+
   /**
   * Returns the locked row, either from the cache or from the database
   *