Patched ruby psych to handle multiline regexp

gistfile1.rb

module Psych
  module Visitors
    class ToRuby < Psych::Visitors::Visitor
    def deserialize o
      if klass = Psych.load_tags[o.tag]
        instance = klass.allocate

        if instance.respond_to?(:init_with)
          coder = Psych::Coder.new(o.tag)
          coder.scalar = o.value
          instance.init_with coder
        end

        return instance
      end

      return o.value if o.quoted
      return @ss.tokenize(o.value) unless o.tag

      case o.tag
      when '!binary', 'tag:yaml.org,2002:binary'
        o.value.unpack('m').first
      when /^!(?:str|ruby\/string)(?::(.*))?/, 'tag:yaml.org,2002:str'
        klass = resolve_class($1)
        if klass
          klass.allocate.replace o.value
        else
          o.value
        end
      when '!ruby/object:BigDecimal'
        require 'bigdecimal'
        BigDecimal._load o.value
      when "!ruby/object:DateTime"
        require 'date'
        @ss.parse_time(o.value).to_datetime
      when "!ruby/object:Complex"
        Complex(o.value)
      when "!ruby/object:Rational"
        Rational(o.value)
      when "!ruby/class", "!ruby/module"
        resolve_class o.value
      when "tag:yaml.org,2002:float", "!float"
        Float(@ss.tokenize(o.value))
      when "!ruby/regexp"
        o.value =~ /^\/(.*)\/([mixn]*)$/ximn
        source  = $1
        options = 0
        lang    = nil
        ($2 || '').split('').each do |option|
          case option
          when 'x' then options |= Regexp::EXTENDED
          when 'i' then options |= Regexp::IGNORECASE
          when 'm' then options |= Regexp::MULTILINE
          when 'n' then options |= Regexp::NOENCODING
          else lang = option
          end
        end
        Regexp.new(*[source, options, lang].compact)
      when "!ruby/range"
        args = o.value.split(/([.]{2,3})/, 2).map { |s|
          accept Nodes::Scalar.new(s)
        }
        args.push(args.delete_at(1) == '...')
        Range.new(*args)
      when /^!ruby\/sym(bol)?:?(.*)?$/
        o.value.to_sym
      else
        @ss.tokenize o.value
      end
    end
    private :deserialize
  end
end
end