validate password with regex nodejs code example

Example 1: js regex password

str.match(/^(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[a-zA-Z]).{8,}$/)

Example 2: javascript password validation special character

function CheckPassword(inputtxt) 
{ 
var paswd=  /^(?=.*[0-9])(?=.*[!@#$%^&*])[a-zA-Z0-9!@#$%^&*]{7,15}$/;
if(inputtxt.value.match(paswd)) 
{ 
alert('Correct, try another...')
return true;
}
else
{ 
alert('Wrong...!')
return false;
}
}