From: jeg2@...
Date: 2014-03-20T14:38:29+00:00
Subject: [ruby-core:61612] [ruby-trunk - Bug #8405] [Closed] CSV module - improper regexp for escaping special characters

Issue #8405 has been updated by James Gray.

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

Applied in changeset r45374.

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* lib/csv.rb: Fixed a broken regular expression that was causing
  CSV to miss escaping some special meaning characters when used
  in parsing.
  Reported by David Unric
  [ruby-core:54986] [Bug #8405]

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Bug #8405: CSV module - improper regexp for escaping special characters
https://bugs.ruby-lang.org/issues/8405#change-45883

* Author: David Unric
* Status: Closed
* Priority: Normal
* Assignee: James Gray
* Category: lib
* Target version: current: 2.2.0
* ruby -v: 2.0.0p0
* Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN
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=begin
There seems to be bug in csv.rb module. If you would like to use some special characters like (({|})) as a quote_char (passed as a parameter to CSV methods like read), program terminates with (({CSV::MalformedCSVError: Missing or stray quote in line xxx})) error message even if the input .csv file is correct.

Bellow is the assignment of the Regexp used for escaping special symbols used in regular expressions:

  1587:  @re_chars =   /#{%"[-][\\.^$?*+{}()|# \r\n\t\f\v]".encode(@encoding)}/

The issue is with the leading (({[-]})) which I find completely wrong and causes miss of all matches it was intended to. The hyphen char "(({-}))" has to be escaped only inside brackets (({[]})) and only if it does not immediately follow the left bracket.

The quick fix for the above issue may look like

  1587:  @re_chars =   /#{%"(?<!\\[)-(?=.*\\])|[\\.^$?*+{}()|# \r\n\t\f\v]".encode(@encoding)}/

I'd like to mention it would also match strings including right bracket without its left counterpart but it doesn't matter anyway. Lookbehind doesn't support quantifiers in Ruby so it would require to rewrite whole substitution code where applied.
=end




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