Issue #8599 has been reported by lhm (Lars Mai).

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Bug #8599: CSV module - error when trying to set backslash as quote_char
https://bugs.ruby-lang.org/issues/8599

Author: lhm (Lars Mai)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: 1.9.3-p392
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


=begin
There may be a bug in the CSV module. I found it impossible to set the backslash as quote_char, trying so gives the following:

 1.9.3-p392 :055 > out = CSV.new($stdout, quote_char: "\\")
 RegexpError: premature end of char-class: /[^\]\[^\]/
 
I tried using Regexp.escape, too, but no luck:

 1.9.3-p392 :060 > out = CSV.new($stdout, quote_char: Regexp.escape("\\"))
 ArgumentError: :quote_char has to be a single character String
 
Is this expected behaviour? 

I'm not sure if it's related, but here the internal and external encodings:
 1.9.3-p392 :061 > Encoding.default_external
 => #<Encoding:UTF-8> 
 1.9.3-p392 :062 > Encoding.default_internal
 => nil

=end


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