Forum: Ruby Pulling values from strings

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Michael F. (Guest)
on 2009-04-14 22:59
I have a string of data that I am trying to pull values from and have
hit a roadblack since I am still getting the hang of Ruby, in Perl this
would be easier but it seems that Ruby may be able to do this much
simpler.

My data starts as -
  send data StartTime: 20090413 13:41:53.000 ScriptName:changeTests
Pass:15 Fail:0 Total:15

Then I am able to regex it to something like -
  ScriptName:changeTests Pass:15 Fail:0 Total:15

The code I have is:
        if line =~ /data/
            # Remove everything from the beginning up to ScriptName
            line.sub!(/^send.*\d\d\d\s/,"")
            # Split the line by space, then get pairs by :
            arr = line.split(/\s/).map do |i|
                t = i.sub(/[a-zA-Z]+\:([a-zA-Z]+|\d{2,3})/)
            end
        end

After the arr = line.split I am not sure what to do, I was playing
around with various ways of pulling the data out but I am not totally
clear on Ruby data structures.  What I would like to do is pull out all
the values to the right of the :'s and save them for a SQL insert
statement, this is data I would like to store in a database after
pulling out the values I need.  Is it easier to use map to be able to
iterate through the values, or can I actually split the data line so
that I can end up with each combined value sort of acting like a hash
key?  I'd appreciate some hints on what might be a good next step so
that after arr I should be able to have values like:
ScriptName = changeTests
Pass = 15
Fail = 0
Total = 15

Thanks
Robert D. (Guest)
on 2009-04-14 23:52
(Received via mailing list)
On Tue, Apr 14, 2009 at 8:59 PM, Michael Furmaniuk
<removed_email_address@domain.invalid> wrote:
>  ScriptName:changeTests Pass:15 Fail:0 Total:15
>
> ScriptName = changeTests
> Pass = 15
> Fail = 0
> Total = 15
Not tested but maybe you can fix errors ;)

 x.split(/\s*(\w+):\s*/)[-8..-1].each_cons(2).map{ |k,v| "#{k} = #{v}" }

which gives you data like

["ScriptName = changeTests", "changeTests = Pass", "Pass = 15", "15 =
Fail", "Fail = 0", "0 = Total", "Total = 15"]

which if printed with puts gives you the output above.

Note also that instead of that you could create a Hash

Hash[ *x.split(/\s*(\w+):\s*/)[-8..-1]]

HTH
Robert
>
> Thanks
> --
> Posted via http://www.ruby-forum.com/.
>
>



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Joel VanderWerf (Guest)
on 2009-04-15 00:42
(Received via mailing list)
Robert D. wrote:
>  x.split(/\s*(\w+):\s*/)[-8..-1].each_cons(2).map{ |k,v| "#{k} = #{v}" }

Scan is also useful for this kind of thing...

s = "ScriptName:changeTests Pass:15 Fail:0 Total:15"
p s.scan(/(\w+):(\S+)/)
# ==> [["ScriptName", "changeTests"], ["Pass", "15"], ["Fail", "0"],
["Total", "15"]]

To deal with the full string:

s = "send data StartTime: 20090413 13:41:53.000 ScriptName:changeTests
Pass:15 Fail:0 Total:15"
a = s.scan(/(\w+):\s*([\s\d:.]+|\S+)/)
p a
# ==> [["StartTime", "20090413 13:41:53.000 "], ["ScriptName",
"changeTests"], ["Pass", "15 "], ["Fail", "0 "], ["Total", "15"]]
a.shift
a.each {|key,val| puts "#{key} = #{val}"}

# ==>
# ScriptName = changeTests
# Pass = 15
# Fail = 0
# Total = 15
Robert D. (Guest)
on 2009-04-15 15:27
(Received via mailing list)
Seems I used only the second best tool for the job ;).
R.
Michael F. (Guest)
on 2009-04-15 16:46
Hmm....didn't realize I had this many options for it all.

Thanks...of course now I have to study these so I can understand what is
going on...ahh the learning!
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