"Find the first item whose car regexp-matches TAG."
(save-match-data
;; Don't use assoc-default since there's no way to distinguish a
;; missing key from a present key with a null cdr.
"Find the first item whose car regexp-matches TAG."
(save-match-data
;; Don't use assoc-default since there's no way to distinguish a
;; missing key from a present key with a null cdr.