/usr/lib/s9fes/help/string-expand is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 9 | S9 LIB (string-expand string) ==> string
(string-expand string integer) ==> string
Expand horizontal tabulation (HT, ASCII 9, aka "TAB") characters
in STRING to spaces. Return a new string. When INTEGER is specified,
expand each TAB to INTEGER spaces at maximum (default = 8).
(let ((tab (integer->char 9)))
(string-expand (string #\x tab #\y))) ==> "x y"
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