Remove comma between [ and {

Question

I'm trying to remove the comma that occurs in

[,{

I've tried two things here with lookbehind and lookahead -

The first is

"(?=\\[),(?=})"

and the second is putting (?=[),(?=}) in side Pattern.quote().

I then do a String.replaceAll(regex,"") , but it does not work.

Where am I going wrong with lookaround?

Answer 1

No need for look-ahead/behind, just use: str.replaceAll("\\{,\\[", "{[");.