替换方括号java

Question

I want to replace text in square brackets with "" in java: 我想用java中的“”替换方括号中的文本：

for example I have the sentence 例如，我有句子

"Hello, [1] this is an example [2], can you help [3] me?"

it should become: 它应该成为：

"Hello, this is an example, can you help me?" “你好，这是一个例子，你能帮助我吗？”

Answer 1

String newStr = str.replaceAll("\\[\\d+\\] ", "");

What this does is to replace all occurrences of a regular expression with the empty String. 这样做是用空String替换所有出现的正则表达式。

The regular expression is this: 正则表达式是这样的：

\\[  // an open square bracket
\\d+ // one or more digits
\\]  // a closing square bracket
     // + a space character

Here's a second version (not what the OP asked for, but a better handling of whitespace): 这是第二个版本（不是OP要求的，但更好地处理空白）：

String newStr = str.replaceAll(" *\\[\\d+\\] *", " ");

What this does is to replace all occurrences of a regular expression with a single space character. 这样做是用一个空格字符替换所有出现的正则表达式。

The regular expression is this: 正则表达式是这样的：

 *   // zero or more spaces
\\[  // an open square bracket
\\d+ // one or more digits
\\]  // a closing square bracket
 *   // zero or more spaces

Answer 2

这应该工作：

.replaceAll("\\[.*?\\]", "").replaceAll(" +", " ");

Answer 3

Please use this, 请用这个，

String str = "[How are you]";
str = str.replaceAll("\\[", "").replaceAll("\\]","");