From: "Wolfgang Nádasi-donner" <ed.odanow@...>
Date: 2007-07-31T04:50:20+09:00
Subject: Re: Finding un-escaped characters in scan()

Fred Phillips wrote:
> I have a string that looks like this: "test,,\,test". And I'm trying to
> count the commas which don't follow a \. But when using scan(/[^\\],/) 
> it
> only finds the first comma. I think this is because after scan() has 
> found a
> comma without a backslash, it continues from where it left off, and 
> since
> there's no character before the next comma, it won't match it. Does 
> anyone
> know how to fix it?

If you can use Ruby 1.9, you simly can express it using 'negative look 
behind':


irb(main):001:0> "test,,\\,test".scan(/(?<!\\),/)
=> [",", ","]
irb(main):002:0> "test,,\\,test,test2,\\,test3".scan(/(?<!\\),/)
=> [",", ",", ",", ","]

Wolfgang Nádasi-Donner
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