use new lilypond 2.25 regexes and font definitions

book_include.ly

@@ -217,16 +217,16 @@ songs =
 %%%%%%%%%%%%%%%%%%%%%%%%%%%
 %% Include Images once and reference them:
 #(define bbox-regexp
-  (make-regexp "%%BoundingBox:[ \t]+([0-9-]+)[ \t]+([0-9-]+)[ \t]+([0-9-]+)[ \t]+([0-9-]+)"))
+  (ly:make-regex "%%BoundingBox:[ \t]+([0-9-]+)[ \t]+([0-9-]+)[ \t]+([0-9-]+)[ \t]+([0-9-]+)"))
 
 #(define (get-postscript-bbox string)
   "Extract the bbox from STRING, or return #f if not present."
   (let*
-      ((match (regexp-exec bbox-regexp string)))
+      ((match (ly:regex-exec bbox-regexp string)))
 
     (if match
         (map (lambda (x)
-               (string->number (match:substring match x)))
+               (string->number (ly:regex-match-substring match x)))
              (cdr (iota 5)))
 
         #f)))