Description:
------------
a problem with internal vars?

/\"([^\"]+\.jpg)\"/ - the pattern works fine...
/([\"\'])([^\\1]+\.jpg)\\1/ - a bit more complex pattern doesn't work as expected!

Reproduce code:
---------------
if( preg_match("%([\"\']{1})([^\\1]+\.jpg)\\1%", '.. "bla bla "image.jpg" .. " bla bla', $matches) )
	print_r($matches);

Expected result:
----------------
Array
(
    [0] => "image.jpg"
    [1] => image.jpg
)

Actual result:
--------------
Array
(
    [0] => "bla bla "image.jpg"
    [1] => "
    [2] => bla bla "image.jpg
)