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Check password has at least 1 uppercase, 1 lowercase , 1 number and 8 characters minimum

Posted on 2009-04-09
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1,660 Views
Last Modified: 2012-05-06
Hi,

I'm just trying to validate a password field.
Can someone please help with an expression to validate that the field has:
1 uppercase, 1 lowercase , 1 number and 8 characters minimum

Thanks.
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Question by:mrduckers
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2 Comments
 
LVL 9

Accepted Solution

by:
Sreedhar Vengala earned 250 total points
ID: 24112740
something on these grounds:
<HTML>
<HEAD>

<script Language="JavaScript">

function checkPassword () {

      var strng  = document.passwordResetForm.newpass.value;
      var strng2 = document.passwordResetForm.verifypass.value;
      var errMsg = "";
      if (strng == "") {
            errMsg = "Enter a password.\n";
      }

      if ((strng.length < 6) || (strng.length > 16)) {
            errMsg += "The password is the wrong length\n";
      }
      if (/[^a-zA-Z0-9]/.test(strng)) {
            errMsg += "The password contains illegal characters.\n";
      }

      if (!/[0-9]/.test(strng) || !/[a-zA-Z]/.test(strng)) {
            errMsg += "The password must contain at least one letter and one numeral.\n";
      }

      if(strng!=strng2)
            errMsg += "Your passwords do not match!\n";
     
      if(errMsg==''){
            return true;
      } else {
            alert(errMsg);
            return false;
      }
return false;

}
</script>

    <title>Password Reset</title>

</HEAD>

<body>

<FORM NAME="passwordResetForm" ACTION=" " METHOD=post onsubmit="return checkPassword()">


           Enter New Password: <input type=text name=newpass value=""><br>
               Verify Password: <input type=text name=verifypass value=""><br><br>

             <input type=submit value="Reset Password"><br><br><br>

</FORM>
</BODY>
</HTML>
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LVL 9

Expert Comment

by:Sreedhar Vengala
ID: 24112751
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