python java正则表达式_如何将python正则表达式转换为java正则表达式？

{{1}你不需要把{1}的结果写进一个{1}，这样你就不需要把^ 1的结果写进^ 1中：Pattern pattern = Pattern.compile("^172\.(1[6789]|2\d|30|31)\.");

String[] test_strings = {"172.19.0.0", "172.24.0.0", "172.45.0.0", "172.19.98.94"};

for (String string : test_strings) {

List list = new ArrayList<>();

for (Matcher matcher = pattern.matcher(string); matcher.find(); )

list.add(matcher.group(1));

System.out.println(list);

}

输出

^{pr2}$

当然，由于regex最多只能找到一个匹配项，因此您的代码应该是：Pattern pattern = Pattern.compile("^172\.(1[6789]|2\d|30|31)\.");

String[] test_strings = {"172.19.0.0", "172.24.0.0", "172.45.0.0", "172.19.98.94"};

for (String string : test_strings) {

Matcher matcher = pattern.matcher(string);

if (matcher.find())

System.out.println(matcher.group(1));

else

System.out.println();

}

输出19

24

19