使用正则表达式替换特定字符串-Java

Question

My goal is to replace a certain substring within a string that doesn't alter those that aren't strictly that substring. It is slightly confusing to write down so let me show you with an example.

Say I have the string

"StackOverflow Stack Overflow Stacks"

Now I would like to replace "Stack" , if I am to use

x.replaceAll("Stack", "")

I will get

"Overflow  Overflow s"

which is not desired, instead I would like the following:

"StackOverflow Overflow Stacks"

Answer 1

使用单词边界 ：

\\bStack\\b

Answer 2

Your requirement is not entirely clear.

You need to think about the conditions for "Stack" to be replaced.

A good example would be a word boundary: x.replaceAll("\\\\bStack\\\\b", "")

This will ensure that "Stack" surrounded by non-word characters will be replaced, while other instances of "Stack" will be left untouched.

You may want to be more specific and only replace when surrounded by whitespace:

• x.replaceAll("(?<=\\\\s)Stack(?=\\\\s)", "") // replaces only "Stack"
• x.replaceAll("\\\\sStack\\\\s", "") // also gets rid of the surrounding whitespace

Etc...

Answer 3

You can use word boundaries to accomplish this:

use the below code for the same:

String abc = "StackOverflow Stack Overflow Stacks";
abc = abc.replaceAll("\\bStack\\b", "");

System.out.println(abc);

The result is printed as StackOverflow Overflow Stacks