php - Parse content from a file

I'm trying to parse a file with the following contents and display it in a table. The problem is that I'm only able to get the first lease stanza. I'm not sure how to get the rest of them? Any ideas?

INPUT:

# The format of this file is documented in the dhcpd.leases manual page.
# This lease file was written by isc-dhcp-V3.0.3b1

lease 192.168.98.25 {
  starts 5 2012/10/05 21:18:41;
  ends 5 2012/10/05 22:48:15;
  tstp 5 2012/10/05 22:18:41;
  binding state free;

  hardware ethernet 78:d6:f0:c1:7f:b5;
  uid "\001x\326\360\301\177\265";
}
lease 192.168.10.1 {
  starts 5 2012/10/04 12:23:23;
  ends 5 2012/10/05 22:48:15;
  binding state active;
  next binding state free;
  hardware ethernet 56:a3:f0:d1:75:b5;
  uid "\001x\326\360\301\177\265";

}
....
....

OUTPUT:

 HW Address  |start time  | end time | IP 
 78:d6:f0:c1:7f:b5 | 2012/10/05 21:18:41 | 2012/10/05 22:48:15 | 192.168.98.25
 56:a3:f0:d1:75:b5 | 2012/10/04 12:23:23 | 2012/10/05 22:48:15 | 192.168.10.1

This is what I've tried so far:

$readfile = file('/etc/dhcp/dhcpd.leases',FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);

$arstring = implode(" ",$readfile);

$regex=array();
preg_match_all("(lease\s*([0-9.]+)\s*{\s*starts\s*.?\s*([0-9/\s:]*).?\s*ends\s*.?\s*([0-9/\s:]*).*ethernet\s*([\w:]*))", $arstring, $regex,PREG_SET_ORDER);

Which gives me:

[0] => Array
    (
        [0] => lease 192.168.98.25 {   starts 5 2012/10/05 21:18:41;   ends 5 2012/10/05 22:18:41;   tstp 5 2012/10/05 22:18:41;   binding state free;   hardware ethernet 78:d6:f0:c1:7f:b5;   uid "\001x\326\360\301\177\265"; } lease 192.168.98.25 {   starts 5 2012/10/05 22:54:15;   ends 5 2012/10/05 23:54:15;   binding state active;   next binding state free;   hardware ethernet 78:d6:f0:c1:7f:b5;   uid "\001x\326\360\301\177\265"; } lease 192.168.98.25 {   starts 5 2012/10/05 22:54:16;   ends 5 2012/10/05 23:54:16;   binding state active;   next binding state free;   hardware ethernet 78:d6:f0:c1:7f:b5
        [1] => 192.168.98.25
        [2] => 2012/10/05 21:18:41
        [3] => 2012/10/05 22:18:41

        [4] => 78:d6:f0:c1:7f:b5
    )