From: Robert Klemme <bob.news@...>
Date: 2004-04-26T17:44:04+09:00
Subject: Re: [NEWBIE] Extract all occurences from a text


"David Alan Black" <dblack@wobblini.net> schrieb im Newsbeitrag
news:m3ekqeu4le.fsf@wobblini.net...
> Hi --
>
> Kristof Bastiaensen <kristof@vleeuwen.org> writes:
>
> > On Fri, 23 Apr 2004 05:08:00 -0700, David Alan Black wrote:
> >
> > > Or even more simply:
> > >
> > >   lines = open(filename).grep(regex)
> > >
> >
> > doesn't that leave the file open?
>
> Sigh -- yes.  That's a recurrent mental glitch I've got.

File#readlines does the trick correctly:

lines = File.readlines(filename).grep(regexp)

Only drawback: there's an intermediate array which burns a lot of mem if
the file is huge.  In those cases better do:

lines = File.open(filenam) do |io|
  l=[]

  while ( line = io.gets )
    l << line if regexp =~ line
  end

  l
end

Regards

    robert