我怎么能preg_grep一个日期

Question

I try to grep a date. $m[0] is dpr_ts><'01/01/2002','31/12/2002'] .

I try to grep 01/01/2002 and 31/12/2002:

$se = preg_grep("/(\d{2}.\d{2}.\d{4})+/", $m);

I'm matching everything. I want to match the dates in an array $se[0] = '01/01/2002' and $se[1] = 31/12/2002.