From: Robert Klemme <shortcutter@...>
Date: 2012-09-03T05:38:43+09:00
Subject: Re: How to get part of a string

On Sun, Sep 2, 2012 at 7:37 PM, Fosiul Alam <lists@ruby-forum.com> wrote:
> HI
>
>
> df -h
> Filesystem            Size  Used Avail Use% Mounted on
>
> /dev/cciss/c0d1p1     1.8T   88M  1.7T   1% /xxx/xxxx/BD55-1
> /dev/cciss/c0d2p1     1.8T   88M  1.7T   1% /xxx/xxxx/BD55-2
> /dev/cciss/c0d3p1     1.8T   88M  1.7T   1% /xxx/xxxx/BD55-3
> /dev/cciss/c0d4p1     1.8T   88M  1.7T   1% /xxx/xxxx/BD55-4
> /dev/cciss/c0d5p1     1.8T   88M  1.7T   1% /xxx/xxxx/BD55-5
>
> Some how i jus want to get whats the code for the cluster
> which is  BD55
>
>
> now /xxx/xxxx/  is same for every line  and after US55(this value
> different for every server)  there would be a - (BD55-)
>
> I would be really help full if any one can help me

One way would be to read this line by line and use Regexp

e.g.

irb(main):001:0> line = '/dev/cciss/c0d5p1     1.8T   88M  1.7T   1%
/xxx/xxxx/BD55-5'
=> "/dev/cciss/c0d5p1     1.8T   88M  1.7T   1% /xxx/xxxx/BD55-5"
irb(main):002:0> line[%r{BD\d+(?=-\d$)}]
=> "BD55"

Kind regards

robert


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