从逗号分隔的字符串中删除尾随逗号 [英] Remove trailing comma from comma-separated string

问题描述

我从数据库中获得了多个逗号（，）的字符串。我想删除最后一个逗号，但我找不到一个简单的方法。

I got String from the database which have multiple commas (,) . I want to remove the last comma but I can't really find a simple way of doing it.

我拥有的： kushalhs，mayurvm，narendrabz，

我想要的是什么： kushalhs，mayurvm，narendrabz

推荐答案

删除，部分紧跟着字符串结尾，你可以这样做：

To remove the ", " part which is immediately followed by end of string, you can do:

str = str.replaceAll(", $", "");

它优雅地处理空列表（空字符串），而不是 lastIndexOf / substring 需要特殊处理此类案例的解决方案。

This handles the empty list (empty string) gracefully, as opposed to lastIndexOf / substring solutions which requires special treatment of such case.

示例代码：

String str = "kushalhs, mayurvm, narendrabz, ";
str = str.replaceAll(", $", "");
System.out.println(str);  // prints "kushalhs, mayurvm, narendrabz"

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注意：由于有一些关于，$部分的注释和建议编辑：表达式应与您想要的结尾部分相匹配删除。

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NOTE: Since there has been some comments and suggested edits about the ", $" part: The expression should match the trailing part that you want to remove.

• 如果您的输入看起来像a，b，c， ，使用，$。


• 如果您的输入看起来像a，b，c， ，使用，$。


• 如果您的输入看起来像 a，b，c，，使用，$。

• If your input looks like "a,b,c,", use ",$".
• If your input looks like "a, b, c, ", use ", $".
• If your input looks like "a , b , c , ", use " , $".

我认为你明白了。

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