Regex for password must contain at least eight characters, at least one number and both lower and uppercase letters and special characters

Question

I want a regular expression to check that:

A password contains at least eight characters, including at least one number and includes both lower and uppercase letter

Answer 1

Demo:

function password_check() {
  pass = document.getElementById("password").value;
  console.log(pass);
  regex = /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$/;
  if (regex.exec(pass) == null) {
    alert('invalid password!')
  }
  else {
    console.log("valid");
  }
}