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comp.lang.ruby

matching regular expression

Joe Van Dyk

3/7/2005 9:05:00 PM

I have a string that contains a list of keys and values.

"key1: a_value, key2: another_value, key3: yet_another_value"

I have an array of ["key1", "key2", "key3"].

I'd like to loop through and find all the values in the string that
have a key in the key array.

My first attempt was:

keys = ["key1", "key2", "key3"]
my_str = "key1: a_value, key2: another_value, key3: yet_another_value"
keys.each do |key|
my_str =~ Regexp.new("#{key}: \\w+")
puts "the value for #{key} was #{$1}"
end

But that's not working properly.

Any ideas?

Thanks,
Joe
5 Answers

Malte Milatz

3/7/2005 9:11:00 PM

0

Joe Van Dyk:
> keys = ["key1", "key2", "key3"]
> my_str = "key1: a_value, key2: another_value, key3: yet_another_value"
> keys.each do |key|
> my_str =~ Regexp.new("#{key}: \\w+")
> puts "the value for #{key} was #{$1}"
> end

You forgot the parantheses in the regular expression:

my_str =~ /#{key}: (\w+)/

Malte

mark sparshatt

3/7/2005 9:13:00 PM

0

Joe Van Dyk wrote:
> I have a string that contains a list of keys and values.
>
> "key1: a_value, key2: another_value, key3: yet_another_value"
>
> I have an array of ["key1", "key2", "key3"].
>
> I'd like to loop through and find all the values in the string that
> have a key in the key array.
>
> My first attempt was:
>
> keys = ["key1", "key2", "key3"]
> my_str = "key1: a_value, key2: another_value, key3: yet_another_value"
> keys.each do |key|
> my_str =~ Regexp.new("#{key}: \\w+")

use this instead
my_str =~ Regexp.new("#{key}: (\\w+)")
you need the brackets in order to capture the substring

> puts "the value for #{key} was #{$1}"
> end
>
> But that's not working properly.
>
> Any ideas?

HTH

--
Mark Sparshatt

Simon Strandgaard

3/7/2005 9:17:00 PM

0

On Tue, 8 Mar 2005 06:04:48 +0900, Joe Van Dyk <joevandyk@gmail.com> wrote:
> My first attempt was:
[snip]
> But that's not working properly.
>
> Any ideas?


try this

Simon-Strandgaards-computer:~/code/experiments/ruby simonstrandgaard$
ruby re1.rb
the value for key1 was a_value
the value for key2 was another_value
the value for key3 was yet_another_value
Simon-Strandgaards-computer:~/code/experiments/ruby simonstrandgaard$
expand -t2 re1.rb
keys = ["key1", "key2", "key3"]
my_str = "key1: a_value, key2: another_value, key3: yet_another_value"
res = my_str.scan(/(\w+):\s(\w+)/)
res.each do |key, val|
puts "the value for #{key} was #{val}"
end
Simon-Strandgaards-computer:~/code/experiments/ruby simonstrandgaard$


--
Simon Strandgaard

Joe Van Dyk

3/7/2005 9:17:00 PM

0

On Tue, 8 Mar 2005 06:13:24 +0900, mark sparshatt
<msparshatt@yahoo.co.uk> wrote:
> Joe Van Dyk wrote:
> > I have a string that contains a list of keys and values.
> >
> > "key1: a_value, key2: another_value, key3: yet_another_value"
> >
> > I have an array of ["key1", "key2", "key3"].
> >
> > I'd like to loop through and find all the values in the string that
> > have a key in the key array.
> >
> > My first attempt was:
> >
> > keys = ["key1", "key2", "key3"]
> > my_str = "key1: a_value, key2: another_value, key3: yet_another_value"
> > keys.each do |key|
> > my_str =~ Regexp.new("#{key}: \\w+")
>
> use this instead
> my_str =~ Regexp.new("#{key}: (\\w+)")
> you need the brackets in order to capture the substring
>
> > puts "the value for #{key} was #{$1}"
> > end
> >
> > But that's not working properly.
> >
> > Any ideas?
>
> HTH
>

Argh, you're right. Thanks.

Robert Klemme

3/8/2005 11:06:00 AM

0


"Simon Strandgaard" <neoneye@gmail.com> schrieb im Newsbeitrag
news:df1390cc050307131663bf0820@mail.gmail.com...
> On Tue, 8 Mar 2005 06:04:48 +0900, Joe Van Dyk <joevandyk@gmail.com>
wrote:
> > My first attempt was:
> [snip]
> > But that's not working properly.
> >
> > Any ideas?
>
>
> try this
>
> Simon-Strandgaards-computer:~/code/experiments/ruby simonstrandgaard$
> ruby re1.rb
> the value for key1 was a_value
> the value for key2 was another_value
> the value for key3 was yet_another_value
> Simon-Strandgaards-computer:~/code/experiments/ruby simonstrandgaard$
> expand -t2 re1.rb
> keys = ["key1", "key2", "key3"]
> my_str = "key1: a_value, key2: another_value, key3: yet_another_value"
> res = my_str.scan(/(\w+):\s(\w+)/)
> res.each do |key, val|
> puts "the value for #{key} was #{val}"
> end
> Simon-Strandgaards-computer:~/code/experiments/ruby simonstrandgaard$

.... and if there are multiple lookups on the same string then using the
code above to create a hash from the string might be a good idea. You can
then do something like:

tmp_hash = ...
result_hash = keys.inject({}){|h,k| h[k]=tmp_hash[k]; h}

Kind regards

robert