From: Wesley Chen <cjq.999@...>
Date: 2009-07-23T10:50:41+09:00
Subject: Re: Question about text parsing

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Perfect.

Thanks.
Wesley Chen.


On Thu, Jul 23, 2009 at 9:43 AM, David A. Black <dblack@rubypal.com> wrote:

> Hi --
>
>
> On Thu, 23 Jul 2009, spox wrote:
>
>  On Wednesday 22 July 2009 14:58:47 Stephen Beard wrote:
>>
>>> Hello,
>>>
>>> I am new to ruby and had a question about parsing text.
>>>
>>> I am trying to parse out the first IP address from a string. I have a
>>> working solution, but it seems like a rather round about way to do it.
>>> This is my current method:
>>>
>>> str = "          inet addr:192.168.1.118  Bcast:192.168.1.255
>>> Mask:255.255.255.0"
>>> ipAddr = ((str.split(':'))[1].split)[0]
>>>
>>> Is there a better way to do this? Thanks in advance.
>>>
>>
>> regexp:
>> str.scan(/addr:([^\s]+)/)[0][0]
>>
>> string math:
>> str.slice(str.index(':')+1, str.index(' B')-str.index(':')-2)
>>
>
> Here's a technique involving subscripting a string with a regular
> expressions. The number 1 at the end causes the whole thing to return
> the contents of the first parenthetical capture (which is all
> consecutive non-space characters following the first colon).
>
> str[/:(\S+)/,1]
>
>
>
> David
>
> --
> David A. Black / Ruby Power and Light, LLC
> Ruby/Rails consulting & training: http://www.rubypal.com
> Now available: The Well-Grounded Rubyist (http://manning.com/black2)
> Training! Intro to Ruby, with Black & Kastner, September 14-17
> (More info: http://rubyurl.com/vmzN)
>
>

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