regex - Custom character classes in Emacs' regexp -

is possible add own character classes emacs in order use them in regular expressions?

let's say, want add class [[:consonant:]] matches letters not vowels in order avoid writing [b-df-hj-np-tv-z] time (and yes, aware shortcut long term want avoid, take simplification of problem).

is possible @ or have use format or concat, respectively? if possible, how do that?

an mwe this:

(defun myfun ()   "finds clusters of 3 or more consonants"   (interactive)   (if (search-forward-regexp "[b-df-hj-np-tv-z]\\{3,\\}")     (message "yepp, here consonant cluster.") ))  (defun myfun-1 ()   "should find clusters of 3 or more consonants."   (interactive)   (if (search-forward-regexp "[[:consonant:]]\\{3,\\}")     (message "yepp, here consonant cluster.") )) 

both functions myfun , myfun-1 should same thing.

one step further i'd know if possible put whole expressions in such "shortcuts",

[[:ending:]] ==> "\\(?:en\\|st\\|t\\|e\\)" 

i not believe can this. there similar released in ample-regexp package found here. taken readme example:

(define-arx h-w-rx   '((h "hello, ")     (w "world"))) ;; -> hello-world-rx  (h-w-rx h w) ;; -> "hello, world"  (h-w-rx (* h w)) ;; -> "\\(?:hello, world\\)*" 

you use define wide range of aliases in 1 big define-arx.