java - 在Java中匹配${123...456}并提取2个数字？

Question

当我知道格式始终为 ${INT1...INT2} 例如，从字符串中期望 2 个整数的最简单的简洁方法是什么？ “您好${123...456}会提取123,456吗？

Answer 1

我会选择带有组和反向引用的模式。

这是一个例子:

String input = "Hello ${123...456}, bye ${789...101112}";
//                           | escaped "$"
//                           |  | escaped "{"
//                           |  |  | first group (any number of digits)
//                           |  |  |    | 3 escaped dots
//                           |  |  |    |       | second group (same as 1st)
//                           |  |  |    |       |    | escaped "}"
Pattern p = Pattern.compile("\\$\\{(\\d+)\\.{3}(\\d+)\\}");
Matcher m = p.matcher(input);
// iterating over matcher's find for multiple matches
while (m.find()) {
    System.out.println("Found...");
    System.out.println("\t" + m.group(1));
    System.out.println("\t" + m.group(2));
}

输出

Found...
    123
    456
Found...
    789
    101112