>>887-888
(defun howm-menu-search-regexp (key)
(let* ((folder (howm-make-folder:files (howm-search-path)))
(is (howm-view-search-folder-items key folder)))
(mapconcat (lambda (item)
(howm-menu-list-format (howm-view-item-basename item)
(howm-item-summary item)))
is
"\n")))

(defun howm-menu-search-reminder (&optional key)
(howm-menu-search-regexp (format howm-reminder-regexp-grep-format
(concat howm-reminder-types (when key (concat ".*" key))))))

(add-to-list 'howm-menu-allow 'howm-menu-search-reminder)

を eval して、メニューに

%here%(howm-menu-search-reminder "ぷろじぇくと１")

で、期待した動作になると思うけどどうよ。