package routines;
public class UserString {
public static int Index(String string, String substring, Integer instance) {
int index = -1;
if (string == null) {
return 0;
}
if (substring == null) {
return 0;
}
if (substring.equals("")) {
return 1;
}
if (instance == null) {
throw new UnsupportedOperationException("Instance is supposed to be NOT NULL!!");
}
if (!string.contains(substring)) {
return 0;
}
index = string.indexOf(substring, 0);
while (--instance > 0 && index != -1) {
index = string.indexOf(substring, index + 1);
}
return ++index;
}
}