Re: help regex replacement

zilore mumba schrieb am 30.04.2012 um 14:28 (-0700):
> sample input 
> 
> start_date = '2012-04-29_00:00:00','2012-04-29_00:00:00','2012-04-29_00:00:00',
>  end_date   = '2012-05-01_00:00:00','2012-05-01_00:00:00','2012-05-01_00:00:00',
> 
> The model would have run on 29th May,  to produce a 48hour forecast to
> 1sr May 2012.
> When I run it on 30th May it should produce a 48hour forecast to 2nd
> May, i.e. change the entries above so that start_date is 30th and
> end_date is 2nd May as below.
> 
> start_date = '2012-04-30_00:00:00','2012-04-30_00:00:00','2012-04-30_00:00:00',
>  end_date   = '2012-05-02_00:00:00','2012-05-02_00:00:00','2012-05-02_00:00:00',

It appears you want to do date arithmetics. Consider using the DateTime
module instead of hacking away at the strings using regular expressions.

https://metacpan.org/module/DateTime

I'm not an expert DateTime user but a cursory reading/skimming of the
man page suggests you'll want to heed this advice:

  If you are going to be using doing date math,
  please read the section "How Datetime Math Works".

https://metacpan.org/module/DateTime#How-Datetime-Math-Works

Good luck,

Michael
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