You say you've tried "everything possible", so just pick the one that gave you the correct solution. ;^)

Seriously, show the code that you've tried. I'm sure someone can (and probably will) just give you the answer, but it's more satisfying to help someone fix their code, rather than handing you the answer. Once you put up some code, someone will be sure to give you a hand finding out where you have difficulties.

I've recently played with YAPE::Regex::Explain, and if you try it out, you can tweak your regular expressions and have it tell you what it will do. That's a pretty good way to see where you're going wrong.

I'm assuming that you've already read perldoc perlre, so I won't bother mentioning it.

...roboticus

When your only tool is a hammer, all problems look like your thumb.

Update: Repaired CPAN link, thanks to toolic and atcroft for the catch!

You want to look at the /s switch on the s/// operator. For instance, with the following code (in a one-liner with -l):

my $str = q{this is "a test} 
    . qq{\n} 
    . q{this is "only a "poor "test}; 
print $str; 
print qq{=====}; 
$str =~ s/"[^"]+"//gs; 
print $str;
[download]

Hope that helps.

Update: 2011-03-09

I cannot help but second roboticus's references and suggestions. There is much useful information (and I now have another module to take a look at when I have "spare" time available again). :)

Update: 2011-03-09

It appears as if the module in question may be YAPE::Regex::Explain (as I found when I tried installing it to play with it myself).

You want to look at the /s switch on the s/// operator.

$str =~ s/"[^"]+"//gs;
[download]

The  /s option has no effect in the expression /"[^"]+"/, it is superfluous.

Technically, but it still signals the authors intentions

1. Most importantly, use a descriptive title. Most users will only see the title before choosing (or not) to look at your question. Right now there's no indication from the title whether you have an interesting problem or not, so most people will probably assume that you don't;
2. Format your post so that literal text (ie the three lines in between quotes) appears exactly as you intend. I had to view source to see what the hell you were talking about;
3. Show us what you've already tried, and instead of just saying "nothing worked" explain how the behaviour of what you've tried differs from what you expected and from what you wanted;
4. Grow a fabulous moustache. Stalin had a fabulous moustache, and everyone was eager to help him, so maybe it'll work for you too!