From: Daniel Finnie <dan@...>
Date: 2008-04-23T13:38:31+09:00
Subject: Re: Extract date from filenames using regex

Hi,

You can use File.mtime(file_name) which will return a Time object.

You can also match with /\d+/ (one or more digits):
>> ("sdf555sadfsdfg")[/\d+/]
=> "555"

But watch out!:
>> ("sdf555sadfs5867dfg")[/\d+/]
=> "555"

For a nice, object-oriented approach to file manipulation in Ruby, you
might want to check out Pathname in the standard library:
http://www.ruby-doc.org/stdlib/libdoc/pathname/rdoc/index.html

Dan

On Tue, Apr 22, 2008 at 11:48 PM, Clement Ow
<clement.ow@asia.bnpparibas.com> wrote:
> I have my code which looks like this:
>  >>   delete= 5 + 2 #escape counting in weekends i.e Sat,Sun
>  >>   folders = $del_path
>  >>    puts delete_date = DateTime.now - delete
>
>  >>    regexp = Regexp.compile(/(\d{4}\d{2}\d{2})/)
>
>  >>    fileData = Struct.new(:name, :size)
>  >>    deleted_files = []
>
>  >>   folders.each do |folder|
>  >>      Dir.glob(folder+"/*") do |file|
>  >>        match = regexp.match(File.basename(file));
>  >>        if match
>  >>          file_date = DateTime.parse(match[1])
>  When my file name is in the format, 20080331 for example, the script
>  will run successfully. However, if the filename has additional
>  characters added to it, say, risk20080331, it'll run an error. And i
>  reckon it's the cause of the above line.
>
>  >>          size = (File.size(file))/1024
>  >>          if delete_date > file_date
>  >>            deleted_files << fileData.new(file,size)
>  >>            FileUtils.rm_r file
>
>  >>            if File.exist?(file)==false
>  >>              puts "Files/Folders deleted: #{file} size: #{size} KB"
>  >>              end #if
>  >>            end #if
>  >>        end #if
>  >>      end #do
>  >>    end #each
>  >>  end #if
>
>  So is there any way I can extract the date using regex or whichever way
>  simpler so I can compare the deletion date and execute the rm_r command?
>  Thanks!
>  --
>  Posted via http://www.ruby-forum.com/.
>
>