匹配$ {123 ... 456}并在Java中提取2个数字？

Question

当我知道格式将始终为${INT1...INT2}（例如，）时，期望从字符串得到2个整数的最简单的简洁方法是什么？ ？。“你好${123...456}将提取123,456

Answer 1

我会去与一个Pattern团体和反向引用

下面是一个例子：

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 

Answer 2

final String string = "${123...456}"; 
final String firstPart = string.substring(string.indexOf("${") + "${".length(), string.indexOf("...")); 
final String secondPart = string.substring(string.indexOf("...") + "...".length(), string.indexOf("}")); 
final Integer integer = Integer.valueOf(firstPart.concat(secondPart));