Elisp has a nice notation for maintainably composing regexes like any other programming expression. Only language I’ve seen offer that. So instead of "/\\*\\(?:[^*]\\|\\*[^/]\\)*\\*+/", the regular expression to match C block comments could be expressed (with inline comments)

(rx "/*"                          ; Initial /*
    (zero-or-more
     (or (not (any "*"))          ;  Either non-*,
         (seq "*"                 ;  or * followed by
              (not (any "/")))))  ;  non-/
    (one-or-more "*")             ; At least one star,
    "/")                          ; and the final /