Regex to remove spaces

Question

How to write a regex to remove spaces in Java? For example ``` Input : " " Output : "" --------------------- Input : " " Output : "" ``` Note that tabs and new lines should not be removed. Only spaces should be removed. Edit : How do we make a check ? For example how to check in an if statement that a String contains only spaces (any number of them) ``` if(<statement>) { //inside statement } ``` For ``` input = " " or input = " " ``` The control should should go inside if statement.

Accepted Answer

The following will do it:

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

Alternatively:

```
str = str.replaceAll(" +", "");
```

In my benchmarks, the latter was ~40% faster than the former.

Regex to remove spaces

Solution

Problem