# Doesn't handle embedded like-quotes
my $re_simpleQuoted = qr[
    ( ["'] )
    (
        (??{ "[^\1]+?" })
    )
    \1
]x;

##</code><code>##

#! perl -slw
use strict;
require 5.008;

my $re_quoted = qr[
	(["']) 										#'"
	(?{ local $q = $^N })
	(
		(??{
			"(?x:
				[^$q]
				|
				(?: (?<!$q)(?: (?: $q ){2} )+ )
				|
				(?: \\$q )
			)+"
		})
	)
	(?{ $quoted = $^N })
	(??{ "$q" })
]x;

while( <DATA> ){
	chomp;
	our $quoted;
	print;
	print "\t<$quoted>" while m[$re_quoted]g;
	print '';
}

__DATA__
unquoted stuff "quoted stuff" unquoted stuff
unquoted stuff 'quoted stuff' unquoted stuff
unquoted stuff "quoted stuff with embedded 'alternate' quotes" unquoted stuff
unquoted stuff 'quoted stuff with embedded "alternate" quotes' unquoted stuff
unquoted stuff "quoted stuff with embedded ""like"" quotes" unquoted stuff
unquoted stuff 'quoted stuff with embedded ''like'' quotes' unquoted stuff
unquoted stuff "quoted stuff with embedded """"like"""" quotes" unquoted stuff
unquoted stuff 'quoted stuff with embedded ''''like'''' quotes' unquoted stuff
unquoted stuff "quoted 'stuff' with escaped \"like\" quotes" unquoted stuff
unquoted stuff 'quoted 'stuff' with escaped \'like\' quotes' unquoted stuff
unquoted stuff "quoted stuff with embedded ""like"" quotes and escaped \"like\" quotes" unquoted stuff
unquoted stuff 'quoted stuff with embedded ''like'' quotes and escaped \'like\' quotes' unquoted stuff

##</code><code>##

D:\Perl\test>quoted.pl8
unquoted stuff "quoted stuff" unquoted stuff
        <quoted stuff>

unquoted stuff 'quoted stuff' unquoted stuff
        <quoted stuff>

unquoted stuff "quoted stuff with embedded 'alternate' quotes" unquoted stuff
        <quoted stuff with embedded 'alternate' quotes>

unquoted stuff 'quoted stuff with embedded "alternate" quotes' unquoted stuff
        <quoted stuff with embedded "alternate" quotes>

unquoted stuff "quoted stuff with embedded ""like"" quotes" unquoted stuff
        <quoted stuff with embedded ""like"" quotes>

unquoted stuff 'quoted stuff with embedded ''like'' quotes' unquoted stuff
        <quoted stuff with embedded ''like'' quotes>

unquoted stuff "quoted stuff with embedded """"like"""" quotes" unquoted stuff
        <quoted stuff with embedded """"like"""" quotes>

unquoted stuff 'quoted stuff with embedded ''''like'''' quotes' unquoted stuff
        <quoted stuff with embedded ''''like'''' quotes>

unquoted stuff "quoted 'stuff' with escaped \"like\" quotes" unquoted stuff
        <quoted 'stuff' with escaped \"like\" quotes>

unquoted stuff 'quoted 'stuff' with escaped \'like\' quotes' unquoted stuff
        <quoted 'stuff' with escaped \'like\' quotes>

unquoted stuff "quoted stuff with embedded ""like"" quotes and escaped \"like\" quotes" unquoted stuff
        <quoted stuff with embedded ""like"" quotes and escaped \"like\" quotes>

unquoted stuff 'quoted stuff with embedded ''like'' quotes and escaped \'like\' quotes' unquoted stuff
        <quoted stuff with embedded ''like'' quotes and escaped \'like\' quotes>