Forum: Ruby-core [Bug #3747] Possible bug of String#count?

Bug #3747: Possible bug of String#count?
http://redmine.ruby-lang.org/issues/show/3747

Author: Ruohao Li
Status: Open, Priority: Low
Category: M17N, Target version: 1.9.1
ruby -v: ruby 1.9.1p429 (2010-07-02 revision 28523) [i386-darwin9]

$ ruby -v
ruby 1.9.1p429 (2010-07-02 revision 28523) [i386-darwin9]
$ cat c.rb
# -*- coding: utf-8 -*-

s = "a\u3042" # \u3042 is the japanese hiragana "a"
puts s.encoding.name
puts s.count("^a")
$ ruby c.rb
UTF-8
0

The result of count method should be 1 but is 0.

Issue #3747 has been updated by Marcus Rückert.


didnt you want to say:
$ puts s.count("a")
1

if you do:
$ s = "^a\u3042"
$ puts s.count("^a")
1


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http://redmine.ruby-lang.org/issues/show/3747

In the documentation of String#count, "Any _other_str_ that starts with 
a
caret (^) is negated". Thus s.count("^a") means the number of characters
that is *not* a, which should be 1.

Issue #3747 has been updated by Yui NARUSE.

Status changed from Assigned to Closed
% Done changed from 0 to 100

This issue was solved with changeset r29146.
Ruohao, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

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http://redmine.ruby-lang.org/issues/show/3747