+> listextract: b
+> listextract: XcX
+> listextract:
+> listextract:
+> listextract: fail
+> Failed: "extract" failed and "fail" requested
+>
+> sort: 1:2:3:4
+> sort: 4,3,2,1
+> sort: a:aa:B:c
+> sort: 10 smtp.ex.com:100 r2.ex.com:666 r99.ex.com
+> sort: 10,smtp.ex.com:100,r2.ex.com:666,r99.ex.com
+> sort: ""
+>