kazu	2017-05-21 10:01:10 +0900 (Sun, 21 May 2017)

  New Revision: 58827

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=58827

  Log:
    Remove redundant square brackets
    
    Use character class directly instead of
    character class in character class.

  Modified files:
    trunk/lib/csv.rb
Index: lib/csv.rb
===================================================================
--- lib/csv.rb	(revision 58826)
+++ lib/csv.rb	(revision 58827)
@@ -1014,7 +1014,7 @@ class CSV https://github.com/ruby/ruby/blob/trunk/lib/csv.rb#L1014
   HeaderConverters = {
     downcase: lambda { |h| h.encode(ConverterEncoding).downcase },
     symbol:   lambda { |h|
-      h.encode(ConverterEncoding).downcase.gsub(/[^[\s\w]]+/, "").strip.
+      h.encode(ConverterEncoding).downcase.gsub(/[^\s\w]+/, "").strip.
                                            gsub(/\s+/, "_").to_sym
     }
   }

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