Issue #12035 has been reported by Peter Camilleri.

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Bug #12035: scanf suspicious results.
https://bugs.ruby-lang.org/issues/12035

* Author: Peter Camilleri
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.3p173 (2015-08-18 revision 51636) [i386-cygwin], ruby 2.1.6p336 (2015-04-13 revision 50298) [i386-mingw32], and ruby 1.9.3p484 (2013-11-22) [i386-mingw32]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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The code: 'a b c'.scanf('%[a] %[b] %[c]')

yields the result: ["a"] and not ["a","b","c"] as expected.

So far it seems that when sets of characters are used, only 
the first one in the parse specification string actually returns 
any data.



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