From: Eliezer Croitoru <eliezer@...>
Date: 2012-08-16T04:46:50+09:00
Subject: Re: string processing

On 8/15/2012 10:00 PM, Fosiul Alam wrote:
> hi
> I am very new to ruby
> what would be the syntax ??
>
> i get output like this
>
> uk-xxxxxxx-Z15A14
> Adding uk-xxxxx-Z15A14 (uk-xxxx-Z15A14) as "Generic SNMP-enabled Host"
> using SNMP v1 with community "public"
> Success - new device-id: (26)
>
> i will be able to parse the line by
>
> cmd each
>
> cmd.each do |item|
>    if ( item =~ /\((\d)\)/ )
>       getnumber = item
>       end
> end
>
> will it work ??
>
this output should be a string and is not enumerable so you can use each 
but you can use "each_line" to inspect each line but "getnumber = item" 
will not extract the number.
and instead of iterating over each line you can use one regex on the 
whole string like:
cmd =~ /\((\d+)\)/

you must use "\d+" to match one or more numbers
the =~ will give bad results on a whole string and you better use the 
scan method.
cmd.scan /\((\d+)\)/
this will return array of strings array
so this:
(cmd.scan /\((\d+)\)/)[0][0]
will give you the result with a one liner.
and i just seen that Robert gave you a nice solution.

Regards,
Eliezer


-- 
Eliezer Croitoru
https://www1.ngtech.co.il
IT consulting for Nonprofit organizations
eliezer <at> ngtech.co.il