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Dear All

I need regular expression for validating same in textbox

minLength: 8,
maxLength: 16,
upperCase: 0,
numbers: 1,
lower case:2 ,
specialChars:Ntt allowed
Updated 26-Mar-12 23:54pm
Amir Mahfoozi 27-Mar-12 6:46am
Are you sure that it can be implemented with regular expressions ?
ProEnggSoft 27-Mar-12 6:51am
It can be implemented. Please see my solution (2)
ProEnggSoft 27-Mar-12 7:22am
+5 for a thought provoking question.
ProEnggSoft 28-Mar-12 6:03am
If your question is answered, you may consider to accept the solution.
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Solution 2

The following regular expression meets the above requirement


It first searches for alpha numeric string of 8 to 16 characters length, then
it searches if there are atleast two numbers and then searches for atleast two small alphabet. Only then the search passes.

It can be tested online here[^]
Dalek Dave 27-Mar-12 7:00am
Yes I agree.

I just couldn't see what the OP wanted at first, his question was not as clear as it could have been.
ProEnggSoft 27-Mar-12 7:06am
Thank you.
Amir Mahfoozi 27-Mar-12 7:18am
+5 I tested it here : and it seems that it works well.
ProEnggSoft 27-Mar-12 7:20am
Thank you.
Amir Mahfoozi 27-Mar-12 7:23am
It was not my question :)
ProEnggSoft 27-Mar-12 7:24am
Extremely sorry. I noticed later and modified my comment.
Amir Mahfoozi 27-Mar-12 7:25am
No problem ;)
Espen Harlinn 27-Mar-12 9:18am
ProEnggSoft 27-Mar-12 12:08pm
Thanks a lot.
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Solution 1


Should do it.

0 to 9 and a to z lower case, minimum length 8 max 16, no special characters added.
mayur csharp G 27-Mar-12 6:14am
Numbers exactly 1
lowercase exactly 2
Dalek Dave 27-Mar-12 6:27am
Please explain how that works?
You need Exactly 1 number, ok easy.
You need Exactly 2 lowercase, again, simple.
You state No Uppercase at all, no problem
You require Zero special character, child's play.

You want it between 8 and 16 characters - er... what the hell are you putting in there?
You cannot have zero upper case, 1 number and 2 lower case with no special characters.

Perhaps you are not asking your question clearly enough.
mayur csharp G 27-Mar-12 6:33am
sorry Dalke i got it

I need exactly

2 small case characters more than 2 allowed

2 digits more than 2 allowed
Dalek Dave 27-Mar-12 6:38am
So MINIMUM of 2 lower case, MINIMUM of 2 Numbers?
mayur csharp G 27-Mar-12 6:40am
yes dear
ProEnggSoft 27-Mar-12 6:52am
Please see my solution (2), whether it works for you.
mayur csharp G 27-Mar-12 7:01am
no it is not working
ProEnggSoft 27-Mar-12 7:06am
I have checked it. It is working. Please give your test string. So that I will also test. Thank you.
mayur csharp G 27-Mar-12 7:07am
function passwordChanged() {
var strength = document.getElementById('strength');
//var strongRegex = new RegExp("^(?=.{8,})(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])(?=.*\\W).*$", "g");
//var mediumRegex = new RegExp("^(?=.{7,})(((?=.*[A-Z])(?=.*[a-z]))|((?=.*[A-Z])(?=.*[0-9]))|((?=.*[a-z])(?=.*[0-9]))).*$", "g");
//var enoughRegex = new RegExp("(?=.{6,}).*", "g");
var last = new RegExp("(?(?=^[a-z0-9]{8,16}$)(?(?=^.*\d{1}.*\d{1}.*$)(?(?=^.*[a-z]{1}.*[a-z]{1}.*$)^[a-z0-9]{8,16}$)))");
var pwd = document.getElementById("pwdPassword");
if (pwd.value.length==0) {
strength.innerHTML = 'Type Password';
//} else if (false == enoughRegex.test(pwd.value)) {
//strength.innerHTML = 'More Characters';
//} else if (strongRegex.test(pwd.value)) {
//strength.innerHTML = '<span style="color:green">Strong!</span>';
//} else if (mediumRegex.test(pwd.value)) {
//strength.innerHTML = '<span style="color:orange">Medium!</span>';
else if (last.test(pwd.value)) {
strength.innerHTML = '<span style="color:orange">Medium!</span>';
else {
strength.innerHTML = '<span style="color:red">Weak!</span>';

ProEnggSoft 27-Mar-12 7:12am
Can you provide some test string to test for.
ProEnggSoft 27-Mar-12 7:16am
You have to put @ in front of pattern, as @"(?......

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