Bug #1953: empty range in String#tr causes unexpected behavior
http://redmine.ruby-lang.org/issues/show/1953
e$B5/I<<Te(B: Yusuke E.
e$B%9%F!<%?%9e(B: Open, e$BM%@hEYe(B: Normal
Target version: 1.9.x
ruby -v: ruby 1.9.2dev (2009-08-18 trunk 24578) [i686-linux
Are these intentional?
“ABC”.tr(“ABC”, “pq-a”) #=> “pqq”
“ABC”.tr(“ABC”, “pq-ar”) #=> “prr”
“ABC”.tr(“ABC”, “pq-ars”) #=> “prs”
“ABC”.tr(“ABC”, “pq-arst”) #=> “prs”
I expect that an exception is raised or that “p-a” equals to
“ponmlk…cba” (descending order).
For reference, empty range is rejected in Perl:
$ perl -e ‘“A” =~ tr/A/q-a/;’
Invalid range “q-a” in transliteration operator at -e line 1.
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Yusuke ENDOH [email protected]