Using Regular Expressions to test passwords

$pw = $_POST["password"];
              
if(empty($_POST)) 
{ echo "
No password input";} 
else { echo "Your password is: ".$pw.""; } 
              
$result;
              
if ( preg_match("/([0-9a-z]{1})(\s)([0-9a-z]{1})/", $pw) ||
     preg_match("/^(\s)/", $pw) ||
     preg_match("/(\s)$/", $pw)
      ) {
     $result = "
 your password contains spaces, no spaces allowed";
         }
               
if (preg_match("/^([a-z]{1,5})$/", $pw)) {
     $result .= "
you password has less then 6 letters.";
        } 

if (!preg_match("/(\d{1})/", $pw)) {
     $result .= "
you need at least 1 number.";
        }
              
if (preg_match("/[A-Z]{1}/", $pw)) {
     $result .= "
No capital letters";
        } 
              
if (preg_match("/.*^(?=.{6})(?!.*[A-Z]{1})(?=.*[a-z])(?=.*[0-9]).*$/", $pw)) {
    $result .= "
Your password is good";
        }
 if (empty($pw)){$result = "";}
 echo $result;
               

password invalid

password is good

               
  var patt1=new RegExp(".*^(?=.{6})(?=.*[a-z])(?=.*[0-9]).*$");
            
$('#jq-pw').keyup(function() {
   var inputpw = $('#jq-pw').val(); 
      $(".bad, .good").removeClass("show");
      $(".bad").addClass("show");     
   if(patt1.test(inputpw)){ 
       $(".bad").removeClass("show");     
       $(".good").addClass("show"); 
   };
    
    
});