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+#!ruby.exe
+
+# AUTHOR: Robert DiCicco
+# DATE: 2022-10-04
+# Challenge 185 Mask Code ( Ruby )
+
+inp = ['ab-cde-123', '123.abc.420', '3abc-0010.xy', '1234567.a', 'a-1234-bc', 'a.b.c.d.e.f']
+
+for code in inp do
+
+  cnt = 0;                    # where we are in the string
+
+  fnd = 0;                    # count of characters changed
+
+  while fnd < 4 do
+
+    if (code[cnt,1] =~ /[0-9]|[a-z]/)
+
+     code[cnt] = 'x'
+
+     fnd += 1
+
+    end
+
+    cnt += 1
+
+  end
+
+  puts code
+
+end