Validate password field

[solution]

Please i need to validate the password field this way, must contain atleast one uppercase letter, lowercase, number.

please i need this to be in someway this format not in jquery cause i have other if statement for other fields.

Not a JS Expert tho.

Thanks 

if(!/^[a-zA-Z]*$/g.test(document.regForm.password.value)) {
							alert("Password must contain an Alphabet(Upper ), Number,");
							document.regForm.lastname.focus();
							return false;
						}

 

[solution]

if(!firstpassword.match((/^(?=.\d)(?=.[a-z])(?=.*[A-Z])[0-9a-zA-Z]{8,}$/))) {
							alert("Password must be Alphanumeric");
							return false;
						}

Above is the code.

It print "Password must be alphanumeric" even if it has combination of both