There is an option for regexen to lazily evaluate. So you could
represent a regex-free string with a regex like that, then whenever
you need it - evaluate the regex, convert it to a string and use it
:).

OR you could store the string 'stuff \#{name}' and later #eval() it or
something similar and less dangerous when you need it's evaluation.

Aur

On 7/18/07, Eric DUMINIL <eric.duminil / gmail.com> wrote:
> Hi
> Thanks for the appreciation!
> Your suggestion is interesting, even though I'm not sure it would work, because:
>
> 'foobar'.parse_for_variables('foo#{name}','#{')
> => {:name=>"bar"}
>
> works, but when you use it with double quotes string:
>
> 'foobar'.parse_for_variables("foo#{name}",'#{')
> NameError: undefined local variable or method `name' for main:Object
>
> it already tries to evaluate "name" inside the string...
> so either you get retrieval or assignment right, but not both :(
> Anyway, assignment is not that big a deal:
>
> (irb) h={:year=>"2005", :user_name=>"mike", :day=>"15", :month=>"10"}
> => {:year=>"2005", :user_name=>"mike", :day=>"15", :month=>"10"}
>
> (irb) 'ftp://ftp.org/DATA/{user_name}/{year}/{month}-{day}.txt'.gsub(/\{(.+?)\}/){h[$1.intern]}
> => "ftp://ftp.org/DATA/mike/2005/10-15.txt"
>
> Best regards,
>
> Eric
>
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> On 18/07/07, Peñá, Botp <botp / delmonte-phil.com> wrote:
> > From: Eric DUMINIL [mailto:eric.duminil / gmail.com]
> > # For example, I would not know which file I should retrieve on:
> > #  'ftp://ftp.org/DATA/mike'
> > # but
> > #  'ftp://ftp.org/DATA/{user_name}/{year}/{month}-{day}.txt' would do
> > # just fine, so that I could, for example, get this hash:
> > #  {:year=>"2005", :user_name=>"mike", :day=>"15", :month=>"10"}
> > # for this filename:
> > #  'ftp://ftp.org/DATA/mike/2005/10-15.txt'
> >
> > very nice.
> > but would it be more practical if we delineate a variable just like we used to in ruby inline string; ie, use #{var} instead of just {var}
> >
> > this would be handy like, if i want to rename or move all folders under /mike/2005/ to /mike/2007/ eg.. the retrieval and assignment string just stay the same...
> >
> > kind regards -botp
> >
> >
>
>