In this blog article, you're shown a quite long function that loop through
your buffers to find out if any of them is associated with a file whose full
name includes "projects". Well, you should not be afraid of using cl:
(require 'cl) (loop for b being the buffers when (string-match "projects" (or (buffer-file-name b) "")) return t)
If you want to collect the list of buffers whose name matches your test,
then replace return t by collect b and you're done. Really, this loop thing
is worth learning.