import java.util.regex.Matcher;
import java.util.regex.Pattern;

final String regex = "(?:[^\\n]+|(?<!\\n)^)\\*{4}";
final String string = "black bla\n"
   + "black bla\n"
   + "****";

final Pattern pattern = Pattern.compile(regex, Pattern.DOTALL);
final Matcher matcher = pattern.matcher(string);

if (matcher.find()) {
    System.out.println("Full match: " + matcher.group(0));
    for (int i = 1; i <= matcher.groupCount(); i++) {
        System.out.println("Group " + i + ": " + matcher.group(i));
    }
}

const rerun = (ev) => {
    if (ev.keyCode === 13) {
        putNumber()
    }
}

good:
===
!==

bad:
==
!=

bad:
const rerun = (ev) => {
    if (ev.keyCode === 13) {
        putOne()
    }
    else {
        putTwo()
    }
}

good:
const rerun = (ev) => {
    if (ev.keyCode === 13) {
        putOne()
        return
    }
    putTwo()
}