^(?=.*[0-9])(?=.*[A-Z])(?=.*[@#$%^&+=!])(?=\S+$).{4,12}$ code example

Example: password pattern regex android

^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=])(?=\\S+$).{4,}$