如何在最后两个下划线之间获取字符串 [英] How to get String between last two underscore

问题描述

我有一个字符串"abcde-abc-db-tada_x12.12_999ZZZ_121121.333"

结果为 999ZZZ

我尝试使用

private static String getValue(String myString) {

    Pattern p = Pattern.compile("_(\\d+)_1");
    Matcher m = p.matcher(myString);
    if (m.matches()) {

        System.out.println(m.group(1));  // Should print 999ZZZ

    } else {
         System.out.println("not found"); 
    }
}

推荐答案

如果要继续使用基于正则表达式的方法，请使用以下模式:

If you want to continue with a regex based approach, then use the following pattern:

.*_([^_]+)_.*

这将贪婪地消耗掉并包括倒数第二个下层幕.然后它将消耗并捕获 9999ZZZ .

This will greedily consume up to and including the second to last underscrore. Then it will consume and capture 9999ZZZ.

代码示例:

String name = "abcde-abc-db-tada_x12.12_999ZZZ_121121.333";
Pattern p = Pattern.compile(".*_([^_]+)_.*");
Matcher m = p.matcher(name);
if (m.matches()) {

    System.out.println(m.group(1));  // Should print 999ZZZ

} else {
     System.out.println("not found"); 
}

演示

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