From: Ne Scripter <stuart.clarke@...>
Date: 2009-09-07T23:28:59+09:00
Subject: Re: Date & time validation

Just an update of where I am. This is what I have

if date =~ (/\d{4}\/\d{2}\/\d{2}/)
  puts date
else
  date = (Date.strptime(date, "%Y/%m/%d"))
end

This works to an extent but does not deal with a string which contains a 
valid date but still invalid data like so

2009/09/07 12:12:12

This would be passed as valid when it is not only a string containing 
yyyy/mm/dd.

Any ideas?

Thanks a lot

Ne Scripter wrote:
> Thanks all for the responses. I am still hitting a bit of a block with 
> this, initially I want to check if a date matches this criteria, then if 
> not do some of the processes that have been suggested.
> 
> I need to say
> if date = yyyy/mm/dd
> puts date
> else
> validate date
> end
> 
> How would I do this? Sorry for so many questions, I am struggling to get 
> my head around the date libraries
> 
> Many thanks
> 
> 
> Robert Klemme wrote:
>> 2009/9/1 Brian Candler <b.candler@pobox.com>:
>>> Max Williams wrote:
>>>> date = (string =~ /^\d{4}\/\d{2}\/\d{2}$/) &&
>>>
>>> Beware: use
>>>
>>> date = (string =~ /\A\d{4}\/\d{2}\/\d{2}\z/) ...
>>>
>>> or else malicious inputs may be able to bypass your validation. (They
>>> might not be able to bypass Date.strptime in this particular instance,
>>> but still you ought to validate correctly)
>> 
>> Then you can do:
>> 
>> 16:48:53 ~$ irb19 -r date
>> Ruby version 1.9.1
>> irb(main):001:0> %w{2009/10/11 2009/10/44}.each do |s|
>> irb(main):002:1* p s
>> irb(main):003:1> date = %r{\A(\d{4})/(\d{2})/(\d{2})\z} =~ s &&
>> Date.new($1.to_i, $2.to_i, $3.to_i)
>> irb(main):004:1> end
>> "2009/10/11"
>> "2009/10/44"
>> ArgumentError: invalid date
>>         from /opt/lib/ruby19/1.9.1/date.rb:809:in `civil'
>>         from (irb):6:in `block in irb_binding'
>>         from (irb):4:in `each'
>>         from (irb):4
>>         from /opt/bin/irb19:12:in `<main>'
>> irb(main):005:0>
>> 
>> Cheers
>> 
>> robert

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