Regular Expression Question

I have this string:

{LOOP x1}string 1{LOOP x2}string 2{LOOP x3}string 3{ENDLOOP}{ENDLOOP}{ENDLOOP}

and need to capture three matchs as:

1st
string 1{LOOP x2}string 2{LOOP x3}string 3{ENDLOOP}{ENDLOOP}

2nd
string 2{LOOP x3}string 3{ENDLOOP}

3rd
string 3

allong with the x1, x2, x3

I'm using this code:

preg_match_all(/{LOOP (.)}(.){ENDLOOP}/Usi, $string, $loops):

  for ($i=0; $i < count($loops[1]); $i++) {
    $fullmatch = $loops[0][$i];
    $x             = $loops[1][$i];  
    $y             = $loops[2][$i];

On the first match $y gets

string 1{LOOP x2}string 2{LOOP x3}string 3

and on the second one $y gets

string 2{LOOP x3}string 3

and no third match.

Any help? Tkx in advance

No regular expressions experts around?????????

Ungreedy matching?

.*?