正则表达式查找字符串中的日期

String reg = "[1-9]\\d{3}(((0[13578]|1[02])([0-2]\\d|3[01]))|((0[469]|11)([0-2]\\d|30))|(02([01]\\d|2[0-8])))"; String str = "C120191030216410"; Pattern pattern = Pattern.compile (reg); Matcher matcher = pattern.matcher (str); while (matcher.find ()) { System.out.println (matcher.group ()); }