Description:
------------
expressions that work in older versions fail on PHP6 unicode.semantics=on

Compared 5.2-dev, 5.3-dev and 6.0-dev snapshots

Reproduce code:
---------------
$line = "* 469 EXISTS\r\n";
if (ereg("[^ ]+ +([^ ]+) +EXISTS", $line, $match)) {
    var_dump($match[1]);
} else {
    var_dump(false);
}

$line = "* 469 FETCH (UID 508 BODY[1]<0> {154}\r\n";
if (ereg('\\{([^\\}]*)\\}', $line, $match)) {
    var_dump($match[1]);
} else {
    var_dump(false);
}

Expected result:
----------------
string(3) "469"
string(3) "154"

Actual result:
--------------
bool(false)

Warning: ereg(): REG_BADRPT in /home/tomas/testbeds/test/php60/bin/ereg.php on line 10
bool(false)