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Task/IBAN/PicoLisp/iban.l

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+(setq *Sizes '((GB . 22) (CH . 21) (SA . 24)))
+
+(de iban (Str)
+   (let Lst
+      (filter
+         '((X) (not (sp? X)))
+         (chop (uppc Str)) )
+      (when
+         (=
+            (cdr (assoc (pack (head 2 Lst)) *Sizes))
+            (length Lst) )
+         (%
+            (format
+               (mapcar
+                  '((X)
+                     (if (upp? X)
+                        (- (char X) 55)
+                        X ) )
+                  (append (nth Lst 5) (head 4 Lst)) ) )
+            97 ) ) ) )
+
+(for I '("sa03 8000 0000 6080 1016 7519"
+         "CH9300762011623852957"
+         "gb82west1234 56987654 32"
+         "GB82WEST000")
+   (if (= 1 (iban I))
+      (println 'Valid)
+      (println 'Invalid) ) )
+
+(bye)