_parse_iso2

# File lib/date/format.rb, line 798
  def self._parse_iso2(str, e) # :nodoc:
    if str.sub!(/\b(\d{2}|\d{4})?-?w(\d{2})(?:-?(\d+))?/in, ' ')
      e.cwyear = $1.to_i if $1
      e.cweek = $2.to_i
      e.cwday = $3.to_i if $3
      true
    elsif str.sub!(/--(\d{2})-(\d{2})\b/n, ' ')
      e.mon = $1.to_i
      e.mday = $2.to_i
      true
    elsif str.sub!(/\b(\d{2}|\d{4})-(\d{2,3})\b/n, ' ')
      e.year = $1.to_i
      if $2.size < 3
        e.mon = $2.to_i
      else
        e.yday = $2.to_i
      end
      true
    end
  end