Regex to match Date

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Better than a crazy huge Regex (assuming this is for validation and not scanning):

require 'date'
def valid_date?( str, format="%m/%d/%Y" )
  Date.strptime(str,format) rescue false
end

And as an editorial aside: Eww! Why would you use such a horribly broken date format? Go for ISO8601, YYYY-MM-DD, which is a valid international standard, has a consistent ordering of parts, and sorts lexicographically as well.

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