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comp.lang.ruby

Pulling values from strings

Michael Furmaniuk

4/14/2009 6:59:00 PM

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
--
Posted via http://www.ruby-....
4 Answers

Robert Dober

4/14/2009 7:52:00 PM

0

On Tue, Apr 14, 2009 at 8:59 PM, Michael Furmaniuk <mfurmaniuk@yahoo.com> w=
rote:
> 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 -
> =A0send 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 -
> =A0ScriptName:changeTests Pass:15 Fail:0 Total:15
>
> The code I have is:
> =A0 =A0 =A0 =A0if line =3D~ /data/
> =A0 =A0 =A0 =A0 =A0 =A0# Remove everything from the beginning up to Scrip=
tName
> =A0 =A0 =A0 =A0 =A0 =A0line.sub!(/^send.*\d\d\d\s/,"")
> =A0 =A0 =A0 =A0 =A0 =A0# Split the line by space, then get pairs by :
> =A0 =A0 =A0 =A0 =A0 =A0arr =3D line.split(/\s/).map do |i|
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0t =3D i.sub(/[a-zA-Z]+\:([a-zA-Z]+|\d{2,3}=
)/)
> =A0 =A0 =A0 =A0 =A0 =A0end
> =A0 =A0 =A0 =A0end
>
> After the arr =3D 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. =A0What 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. =A0Is 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? =A0I'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 =3D changeTests
> Pass =3D 15
> Fail =3D 0
> Total =3D 15
Not tested but maybe you can fix errors ;)

x.split(/\s*(\w+):\s*/)[-8..-1].each_cons(2).map{ |k,v| "#{k} =3D #{v}" }

which gives you data like

["ScriptName =3D changeTests", "changeTests =3D Pass", "Pass =3D 15", "15 =
=3D
Fail", "Fail =3D 0", "0 =3D Total", "Total =3D 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-....
>
>



--=20
Si tu veux construire un bateau ...
Ne rassemble pas des hommes pour aller chercher du bois, pr=E9parer des
outils, r=E9partir les t=E2ches, all=E9ger le travail=85 mais enseigne aux
gens la nostalgie de l=92infini de la mer.

If you want to build a ship, don=92t herd people together to collect
wood and don=92t assign them tasks and work, but rather teach them to
long for the endless immensity of the sea.

--
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Joel VanderWerf

4/14/2009 8:42:00 PM

0

Robert Dober 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

--
vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407

Robert Dober

4/15/2009 11:27:00 AM

0

Seems I used only the second best tool for the job ;).
R.

Michael Furmaniuk

4/15/2009 12:46:00 PM

0

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!

--
Posted via http://www.ruby-....