Replace uppercase letter with underscore + lowercase character in Java?

Question

Is there a way to use RegEx in Java to replace all uppercase letters with an underscore and a single letter only in lower case?

Example: getSpecialString→get_special_string

Answer 1

Just try:

"getSpecialString".replaceAll("([A-Z])", "_$1").toLowerCase();

Answer 2

There is a snakeCase method in underscore-java :

import com.github.underscore.lodash.$;

public class Main {

    public static void main(String[] args) {
        $.snakeCase("getSpecialString"); // -> get_special_string
    }
}