/usr/lib/help/string-scan is in scheme9 2013.11.26-1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 | S9 LIB (string-scan char string) ==> integer | #f
(string-ci-scan char string) ==> integer | #f
(load-from-library "string-scan.scm")
Scan STRING for CHAR. When STRING contains CHAR, return its position,
otherwise return #F. STRING-CI-SCAN does the same but ignores case.
(string-scan #\y "xyz") ==> 1
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