从一个字符串数组中删除一个字符

I've been trying to remove a specific character from an Array of Strings but continue to fail. The char is "$", I don't know what I'm doing wrong so hoping someone would be able to point to the right direction, my code:

我一直在尝试从字符串数组中删除特定字符，但仍然会失败。 char是“$”，我不知道我做错了什么，所以希望有人能够指出正确的方向，我的代码：

for (int y = 0; y<possibleAnswers.length;y++) {
        display = possibleAnswers[y].replaceAll("$", "");
        System.out.println(display);
    }

possibleAnswers contains 4 Strings, one of the 4 has a "$", I want to remove it before displaying it.

possibleAnswers包含4个字符串，其中一个有“$”，我想在显示它之前删除它。

When I run the above code, the "$" is displayed, any ideas?

当我运行上面的代码时，显示“$”，任何想法？

6 个解决方案

#1

The problem with your code is that replaceAll() expects a "regular expression". The $ character has a specific meaning when used in a regular expression. Therefore you have two options:

你的代码的问题是replaceAll（）需要一个“正则表达式”。在正则表达式中使用时，$字符具有特定含义。因此，您有两种选择：

Keep using replaceAll(); then you have to "escape the special character"; by using replaceAll("\\$", ""), or "[$]" as others have pointed out.
继续使用replaceAll（）;那么你必须“逃避特殊性格”;通过使用replaceAll（“\\ $”，“”）或“[$]”，正如其他人指出的那样。
Use a different method, like replace() that doesn't expect a "regular expression pattern string".
使用不同的方法，例如不期望“正则表达式模式字符串”的replace（）。

#2

replaceAll() accepts a regex, not just a character. When you say "$", you're not telling it to match the '$' character, but to match the ending position of the String or before a newline before the end of the String.

replaceAll（）接受正则表达式，而不仅仅是一个字符。当你说“$”时，你并没有告诉它匹配'$'字符，而是匹配字符串的结束位置或字符串结束前的换行符之前。

You need to escape the '$', so it knows to match just the character, and not treat it like it's special regex meaning.

你需要逃避'$'，所以它知道只匹配角色，而不是像它的特殊正则表达式那样对待它。

Do this like: possibleAnswers[y].replaceAll("\\$", "");

这样做：possibleAnswers [y] .replaceAll（“\\ $”，“”）;

#3

IN your code the $ is keyword in regex for matching end of line i.e. $. SO you will have to escape it as below.

在你的代码中，$是regex中的关键字，用于匹配行尾，即$。所以你必须如下所述逃脱它。

display = possibleAnswers[y].replaceAll("\\$", "");

#4

Try

尝试

possibleAnswers[y].replaceAll("\\$", "");

escape the character because $ is a special character in regular expression and since replaceAll() take regular expression the string you passed is unidentified.

转义字符是因为$是正则表达式中的特殊字符，因为replaceAll（）采用正则表达式，所以传递的字符串是未识别的。

You can also use replace() which take string

你也可以使用带字符串的replace（）

 possibleAnswers[y].replace("$", "");

#5

Just use possibleAnswers[y].replace("$", ""); to remove "$" from string.

只需使用possibleAnswers [y] .replace（“$”，“”）;从字符串中删除“$”。

#6

for (int y = 0; y < possibleAnswers.length; y++) {
        display = possibleAnswers[y].replace("$", "");
        System.out.println(display);
    }

As suggested, I used replace method instead of replaceAll and it did the job. At the same time I learned to look at documentation for deeper understanding of such methods.

正如所建议的那样，我使用replace方法而不是replaceAll，它完成了这项工作。与此同时，我学会了阅读文档，以便更深入地理解这些方法。

Thanks for all the help guys, truly appreciated.

感谢所有帮助人员，真的很感激。

#1