From: Stefano Crocco <stefano.crocco@...>
Date: 2008-03-26T01:56:26+09:00
Subject: Re: remove regex matched line question

On Tuesday 25 March 2008, Ikuta Lin wrote:
> I wrote the code to query a txt file, and tried remove matched line like
> as below
> but it not work as well, can someone help?
> ------------------------
> code:
>
> src = File.open("./src.txt").readlines
> puts src.inspect
> src.collect do |e|
>  if e=~/^(#)/
>   src.delete(e)
>  end
> end
> puts src.inspect
> -------------------------
> txt
>
> #/etc/passwd
> #/etc/shadow
> /etc/group
>
> ------------------------
> problem
> ["#/etc/passwd \r\n", "#/etc/shadow \r\n", "/etc/group \r\n"]
> ["#/etc/shadow \r\n", "/etc/group \r\n"]
>  ------------------
>  still available?

If I understand you correctly, you want to remove from the array src all the 
lines which start with #. In this case, you want reject:

src.delete_if{|l| l.match =~/^#/}

It's usually unwise to remove (and maybe also to add) items to an array while 
iterating on it using each or similar methods. 

I hope this helps

Stefano