How to replace ? from string with another string in java

Asked May 25 '22 at 06:59

Active May 25 '22 at 07:03

Viewed 25 times

How to replace a ? from string with another. Here is my sample code

String oldString = "I am ? ?";
String newString = oldString.replaceAll("?|?", "Java|Developer");
System.out.println(newString);

and gives error

Exception in thread "main" java.util.regex.PatternSyntaxException: Dangling meta character '?' near index 0

If I use another way like

String oldString = "I am J D";
String newString = oldString.replaceAll("J|D", "Java|Developer");
System.out.println(newString);

and the output is

I am Java|Developer Java|Developer

My requirement is

Input: I am ? ?
Output: I am Java Developer

Is there any way to achieve it?

edited May 25 '22 at 07:03

asked May 25 '22 at 06:59

Alyan Ahmed

Read a regular expression tutrial, e.g. https://docs.oracle.com/javase/tutorial/essential/regex/ – tgdavies May 25 '22 at 07:01
1

Well, one not-too-elegant way would be `oldString.replace("?", "%s").formatted("Java", "Developer")`. – MC Emperor May 25 '22 at 07:03
@MCEmperor the way is working for characters not the "?". Is there any way to use "?". – Alyan Ahmed May 25 '22 at 07:07
I have found the solution for `"?"` to `"\\?"` from https://stackoverflow.com/a/23864310/16974685 – Alyan Ahmed May 25 '22 at 07:11
@AlyanAhmed Read carefully. I used `replace` instead of `replaceAll`. – MC Emperor May 25 '22 at 07:16
@MCEmperor no changes on `replace` for `"\\?"` but `replaceAll` is working for `"\\?"` – Alyan Ahmed May 25 '22 at 07:25

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