How to verify a password which contain .......

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Hi all,

I have a registration page which contains a password field.But i want the password field must contains all the following below as

1)lower case letter
2)one upper case letter
3)special character
4)one number

Thanks

Posted 7-Sep-11 16:31pm

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Firo Atrum Ventus · Answer 1 · 2011-09-07T17:07:00

Solution 1

Why? Haven't you read this[^]?

Anyway, RegEx[^] will do.

Posted 7-Sep-11 17:07pm

Firo Atrum Ventus

Comments

Sergey Alexandrovich Kryukov 8-Sep-11 1:10am

Exactly. My 5.
--SA

Simon Bang Terkildsen · Answer 2 · 2011-09-07T17:24:00

Solution 2

Like Firo said Regex can do that for you, I've put one together for you

(?=^.{8})(?=.*[a-z])(?=.*[A-Z])(?=.*[^\w\d])(?=.*\d).*$

You can find plenty more if you Google for it.

There is however more to a strong password than the 4 points you posted.
1) Length (included in the regex a I gave you; min. length 8)
2) Sequential letters/digits (e.g. abc, 12345) this makes the password less strong
3) Case insensitive repeated characters (e.g. XxXXxx) this makes the password less strong
4) The list here goes on, with what makes a password more or less strong. I wont type it all out here though as I believe you have the info you want.

Posted 7-Sep-11 17:24pm

Simon Bang Terkildsen

Updated 7-Sep-11 18:02pm

v3

Comments

[no name] 8-Sep-11 0:19am

Good answer my 5!!!

Simon Bang Terkildsen 8-Sep-11 1:16am

Thank you

Sergey Alexandrovich Kryukov 8-Sep-11 1:13am

I disagree with item #3. If you think about it, the difference is mostly psychological. Overall, my 5.
--SA

Simon Bang Terkildsen 8-Sep-11 1:37am

Thank you, about #3 AAaaaa@1 as safe as Hjay#1@Q, if you watch someone entering those two passwords it'll be easier for you to catch and remember the first one. Which is the reason I use #3 when calculating password strength.