Is it possible to grep the quickfix window in Vim?

Question

Let’s say I use the ag.vim plugin to search for the string disabled through multiple files. It returns me some results in the quickfix window:

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Answer 1

My solution to this problem has always been to make the quickfix buffer modifiable by default:

:autocmd BufReadPost quickfix set modifiable

(The above command is to be put in the .vimrc file.)

Doing this opens a whole range of possibilities for any appropriate edits, such as removing unrelated entries manually or by filtering using the :global and :vglobal commands, grouping and reordering related entries, adding blank lines or comments in free form, etc.