CSV::Parser#prepare_quoted

# File tmp/rubies/ruby-3.1.3/lib/csv/parser.rb, line 636
def prepare_quoted
  if @quote_character
    @quotes = Regexp.new(@escaped_quote_character +
                         "+".encode(@encoding))
    no_quoted_values = @escaped_quote_character.dup
    if @backslash_quote
      no_quoted_values << @escaped_backslash_character
    end
    @quoted_value = Regexp.new("[^".encode(@encoding) +
                               no_quoted_values +
                               "]+".encode(@encoding))
  end
  if @escaped_strip
    @split_column_separator = Regexp.new(@escaped_strip +
                                         "*".encode(@encoding) +
                                         @escaped_column_separator +
                                         @escaped_strip +
                                         "*".encode(@encoding))
  else
    if @column_separator == " ".encode(@encoding)
      @split_column_separator = Regexp.new(@escaped_column_separator)
    else
      @split_column_separator = @column_separator
    end
  end
end