Ah, yes, the default Splitter stuff indeed doesn't work ;-) How about [something like](http://docs.oracle.com/javase/6/docs/api/java/lang/String.html#split\(java.lang.String, int\)):
```
String[] parts = containerAndPrefix.split("/", 2);
checkArgument(parts.length == 2, "No separator '/' found in '%s'", containerAndPrefix);
removeObjectsWithPrefix(parts[0], parts[1]);
```
?