ISBN13 check digit: Difference between revisions

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@@ Line 1,966: / Line 1,966: @@
     .s = replace(.s, RE/[\- ]/)
     var .alt = true
-    matching(re/^[0-9]{13}$/, .s) and
+    .s -> re/^[0-9]{13}$/ and
         for[=0] .d in s2n(.s) { _for += if(not= .alt: .d x 3; .d) } div 10
 }