将字符串 java 中的所有“+”字符替换为空字符

Question

I have a string

String myString = "Hello+World+How are you";

How to replace all "+" in myString with empty character

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I tried with : myString.replaceAll("+"," ");

What I am trying to find : Regular expression for + so I can replace all occurrences

Output I am trying to achieve: Hello World How are you

Answer 1

try with like this

myString.replace("+"," ");

Answer 2

I usually use Pattern.quote(String)

String myString = "Hello+World+How are you";
String replaced = myString.replaceAll(Pattern.quote("+"), " ");

I think it is less error-prone if you (or someone else) need to modify the regexp later.

Answer 3

You should use \\ with any special charachter in java,so your code will be like this to replace + with whitespace:

myString.replaceAll("\\+"," ");

Explanation: \ this is used to escape special characters,and this \ itself is a special character,that is why we have to use '\\'.