From: Peter Vanderhaden <bostonantifan@...>
Date: 2007-11-23T21:25:20+09:00
Subject: Re: help needed using a regex .sub

Alex,
Your solution is exactly what I need, thank you very much!  I'm getting 
better with regular expressions the more I work with them, and I really 
appreciate your explanation of this regex.
PV

Alex LeDonne wrote:
> On Nov 22, 2007 6:33 AM, Peter Vanderhaden <bostonantifan@yahoo.com> 
> wrote:
>>
>> ideas?  I'd be very grateful!
>> PV
> 
> You might want to use a CSV library, like FasterCSV. But if you don't
> want that overhead and really want to use a regex...
> 
> When you say the "first instance of ,,", do you really mean "only if
> the first comma on the line is immediately followed by another comma"?
> 
> @record.sub!(/^([^,]*),,/, '\1,NULL,')
> 
> That regex is: Start at the beginning of the line, match all the
> non-comma characters, followed by 2 commas.
> The replacement is: All the non-comma characters, then ',NULL,'
> instead of the two commas.
> 
> -Alex

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