Question

This is just an example code of the thing i try to accomplish.

String s = "hello(1234aA)something";
String replaceString = "(1234aa)";
String s2 = s.replaceAll("(i?)" + replaceString, "something");

The String s is going to be the same but can differ in case, thats why i use (i?) in replaceall.
How can i make regex ignore the special

Answer 1

Use quote(), it seems you’ve already figured out the ignore case, but you should use (?i), not (i?).

String s = "hello(1234aA)something";
String replaceString = "(?i)" + Pattern.quote("(1234aa)");
String s2 = s.replaceAll(replaceString, "something");

This should work.