From: "David A. Black" <dblack@...>
Date: 2005-04-07T22:47:07+09:00
Subject: Re: Regular expression mismatch ?

Hi --

On Thu, 7 Apr 2005, Kujawa, Greg wrote:

>
> -----Original Message-----
> From: David A. Black [mailto:dblack@wobblini.net]
> Sent: Thursday, April 07, 2005 9:09 AM
> To: ruby-talk@ruby-lang.org
> Subject: Re: Regular expression mismatch ?
>
>
> Hi --
>
> On Thu, 7 Apr 2005, Han Holl wrote:
>
>> On Apr 7, 2005 12:34 PM, David A. Black
>>> The /m suffix means that \n is included in . (dot).
>>>
>> Yes, looked it up in the Pickaxe, and indeed that's what it says.
>>
>> This is from man perlre:
>>       m   Treat string as multiple lines.  That is, change "^" and "$"
>>    from matching the start or end of the string to matching then
>>    start or end of any line anywhere within the string.
>>
>> This should go on the page I've seen somewhere with gotchas. Perl RE
>> is quite widespread, and when ruby deviates from it it's easy to trip
>> up.
>
> Not if you use Ruby more and more :-)
> Good point. Anyone who has worked with regexes in the various languages can
> attest to subtle (but far-reaching) differences between them. I recall the
> first time I picked up the "Mastering Regular Expressions" book. A veritable
> Bible for the beasties...

That's the thing... for better or worse, there's no single model for
how regexes work.  Some things are more universal than others, but I
don't think there's any shortcut to adapting to whatever incarnation
of them one is using at a given time.


David

-- 
David A. Black
dblack@wobblini.net