Need regular expression

Mayur Gujrathi

14y5.8k.NET

Dear All

I need regular expression for validating same in textbox

minLength: 8,
maxLength: 16,
upperCase: 0,
numbers: 1,
lowease:2 ,
specialChars:Not allowed
Symbols:Not Allowed

20 Replies

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Vulpes14y ago
Accepted answer
OK, try this:

string regExp = @"^(?=.*\d.*?\d)(?=.*[a-z].*?[a-z])([a-zA-z0-9^${}[().*+?|<>&]|]|-|\\){8,16}$";
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Vulpes14y ago
I'd try breaking it down to see if you can figure out what is stopping it workly correctly in IE.

See if this will work for starters and, if it does, add successive special characters between the [..] until it stops working:

var expr = /^(?=.*\d.*?\d)(?=.*[a-z].*?[a-z])[a-zA-z0-9]{8,16}$/
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Mayur Gujrathi14y ago
Still it is not running in ie i need it in ie...running fine in other browsers
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Vulpes14y ago
There must be some difference between the JavaScript regular expression engines for those browsers.

You could try rearranging the regular expression to see if IE will then give the correct results.

Previously, to avoid any confusion, I left the special characters ], - and \ out of the list of characters within the [...] and OR'ed them with the list instead.

I'd try bringing them within the [...] in 'escaped' form:

var expr = /^(?=.*\d.*?\d)(?=.*[a-z].*?[a-z])[a-zA-z0-9^${}[().*+?|<>&\\\]\-]{8,16}$/
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Mayur Gujrathi14y ago
You are right it not running in ie but running fine in mozila
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Vulpes14y ago
Well, to make sure there's no mistake, I've copied it back into my file exactly as you have it but the alert box is showing OK as it should do.

It's just the same whether I run the JavaScript from the command line or within my browser (Google Chrome) so I'm at a loss to explain why it's not working for you.

As it's unlikely now that anyone else will reply to this thread, all I can suggest is that you start a new thread and see if someone else can come up with a different regular expression that does work correctly for you.
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Mayur Gujrathi14y ago
I am not getting why same is not validating on my side

it is giving message not ok

function passwordChanged()
{

var text = "mm33mm33";
var expr = /^(?=.*\d.*?\d)(?=.*[a-z].*?[a-z])([a-zA-z0-9^${}[().*+?|<>&]|]|-|\\){8,16}$/
if(expr.test(text))
{
   alert("OK");
   return false;
   }
else
{
alert("Not OK")
}


}



                       Type Password
                       Type Password
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Vulpes14y ago
This JavaScript is validating OK for me:

var text = "mm33mm33";
var expr = /^(?=.*\d.*?\d)(?=.*[a-z].*?[a-z])([a-zA-z0-9^${}[().*+?|<>&]|]|-|\\){8,16}$/
if(expr.test(text))
WScript.Echo("OK");
else
WScript.Echo("Not OK")
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Mayur Gujrathi14y ago
Thanks vuples for replying

But it is still having one problem

It is validating on 10 characters

If i am entering mm33mm33 then it is not validating here i have to put 2 more alphabets
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Vulpes14y ago
I don't think you've got the regular expression quite right.

Try replacing this line:

var last = new RegExp("^(?=.*\d.*?\d)(?=.*[a-z].*?[a-z])([a-zA-z0-9^${}[().*+?|<>&]|]|-|\\){8,16}$)");

with this:

var last = /^(?=.*\d.*?\d)(?=.*[a-z].*?[a-z])([a-zA-z0-9^${}[().*+?|<>&]|]|-|\\){8,16}$/
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Mayur Gujrathi14y ago
Dear Vulpes please reply
0
Mayur Gujrathi14y ago
Dear Vuple it is validating only letter 'd'
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Mayur Gujrathi14y ago
Dear Vuples

As soon as I am giving i/p like any 2 small case characters first in textbox it is validating

function passwordChanged()
{
var strength = document.getElementById('strength');
var last = new RegExp("^(?=.*\d.*?\d)(?=.*[a-z].*?[a-z])([a-zA-z0-9^${}[().*+?|<>&]|]|-|\\){8,16}$)");

var pwd = document.getElementById("pwdPassword");
if (pwd.value.length==0)
{
strength.innerHTML = 'Type Password';
}
else if (last.test(pwd.value))
{
strength.innerHTML = 'Strong!';
}
else
{
strength.innerHTML = 'Weak!';
}
}

it should not validate until and unless there are 2 small case letters and 2 numbers in textbox
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Mayur Gujrathi14y ago
Thanks vuples
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Vulpes14y ago
All those strings are invalid as they have less than 8 characters.
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Mayur Gujrathi14y ago
No vuples it is not working as soon as i enter dddd or 12ss it is passing validations or ss or 33

my java script function

function passwordChanged() {
var strength = document.getElementById('strength');
var last = new RegExp("^(?=.*\d.*?\d)(?=.*[a-z].*?[a-z])([a-zA-z0-9^${}[().*+?|<>&]|]|-|\\){8,16}$)");
var pwd = document.getElementById("pwdPassword");
if (pwd.value.length==0) {
strength.innerHTML = 'Type Password';

}
else if (last.test(pwd.value)) {
strength.innerHTML = 'Medium!';
}
else {
strength.innerHTML = 'Weak!';
}

}
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Mayur Gujrathi14y ago
Yes Sir Exactly
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Vulpes14y ago
When you say 'special characters', do you mean the Regular expression 'metacharacters' which are listed in the link below?

http://www.fon.hum.uva.nl/praat/manual/Regular_expressions_1__Special_characters.html
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Mayur Gujrathi14y ago
Thanks Vuples for your reply

My req is change, sorry for the same

I need exactly

2 small case characters more than 2 allowed

2 digits exactly more than 2 allowed

Allow special characters
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Vulpes14y ago
When you say that no special characters or symbols are allowed, I assume you mean that only a-z, A-Z and 0-9 are allowed.

When you also give a quantity for upper case, lower case and numbers, I assume that those quantities are minima as otherwise there's no way they will add up to a minimum of 8.

Subject to those assumptions, try this:

string regExp = @"^(?=.*\d)(?=.*[a-z].*?[a-z])[a-zA-z0-9]{8,16}$";
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