Pregmatching都只是返回第一個Asertion

Question

我試着去抓住分秒從 $time = 02:00:00 與 preg_match_all('/^(\d\d):?/', $time, $all_matches); 但它只返回第一個Asertion。 array ( 0 => array ( 0 => '02:', ), 1 => array ( 0 => '02', ), ) 說preg_match_all查找字符串上的所有斷言， 正則表達式中缺少正確答案的正則表達式缺失了什麼？

Answer 1

preg_match_all('/^(\d\d):(\d\d):(\d\d)/', $time, $all_matches); 作品。