Unfortunately you can't filter on attribute "block of text" which is multi line text. More information about this can be found here: http://ez.no/doc/ez_publish/technical_manual/4_0/reference/modules/content/fetch_functions/list
You can of course do it in the template something like this:
hi, your code works but there is a problem: when a comment has been posted by the user and has not yet confirmed, it replaces an element in the "approved" but he did not data in the field "response", it does nothing but it still removes an item from the list. It is there no way to make a filter? I saw a doc on "extend_attribute_filter" I do not know if it can help me but the height is that I did not understand how it works!
Yes, it could be done with extended_attribute_filter but it could be hard for less experienced developer (knowledge of SQL and eZ DB model). I suggest you try to solve it in the template.