Regular expressions javascript validation

hi

I have the following JavaScript code that is working:

<script>
function validate(form) {
// Shortcut to save writing
var pwd = form.elements.lgps.value;

// Check length
if(8 > pwd.length || pwd.length > 16)
return false;

// Check for at least 1 lowercase letter
var rgx = /[a-zA-Z]+/;
if(!rgx.test(pwd))
return false;

// Check for at least 1 digit
rgx = /\d+/;
if(!rgx.test(pwd))
return false;

// Check for no spaces
rgx = /\s/;
if(rgx.test(pwd))
return false;

return true;
}
</script>

Code (markup):

And here's my form:

<form method="post" action="406.php" language="javascript" name="myform" id="myform" onsubmit="return validate(this);">

<input id="lgem" name="lgem" maxlength="20"></div>

<input id="lgps" name="lgps" type="password" maxlength="20" >

<input type="image" value="Entra" id="entraButton" src="entra.jpg" width="81">
</form>

Code (markup):

I would like to add a message alert if all the above fails, and also another field in my form to validate. So basically I have a username field and a password field. I want the password field to be between 8 and 20 characters long, and contain at least 1 digit.

 

// Check for at least 1 lowercase letter
var rgx = /[a-zA-Z]+/;

That actually checks for any character that is either lower or upper.

 

You can call the validate method from a wrapper method which throws an alert.

function checkForm(form)  {
    if (!validate(form)) {
        alert("Your password is weak. Please Renter.");
        return false;
   }
    return true;
}

Code (markup):

You can then call this method on submit.