Comments on: Password Regular Expression Fun

By: paul jackson

paul jackson — Wed, 22 Apr 2009 01:32:37 +0000

I am having a hard time with a pass word for a twic card it keeps saying pass word does no match

By: David

David — Mon, 27 Oct 2008 23:52:40 +0000

Barney,

Solving the problem with logic is great, but sometimes you have to solve the problem with data so you can store said logic somewhere, and a regular expression provides you with a great way to do.

By: Satya

Satya — Sun, 26 Oct 2008 17:19:39 +0000

I require a regex pattern to check the password with following conditions:
Min 6 characters and a Max of 15
1.One Uper character
2.One lower character
3.One speceial character
4.One number(0-9)
passwrod should not contain any whitespaces
At least 3 of 4 above mentioned conditions should match to be valid a password

Thanks in advance.

By: laxman

laxman — Sat, 29 Mar 2008 06:14:00 +0000

i require a regex pattern to check the password with following conditions:
->min 5 characters and a max of 10
->only alphanumeric
->no whitespaces or special characters
->atleast one number in the password

By: tony

tony — Wed, 20 Feb 2008 08:45:23 +0000

By: sanjeev

sanjeev — Thu, 15 Mar 2007 10:46:07 +0000

I need a regular expression that tracks that the passowrd is of minimum 8 characters and sould contain atleat one alphabet, one digit and one special character

By: Sachin

Sachin — Tue, 06 Mar 2007 12:42:51 +0000

I have tried following regular expression but its not working properly.Please look into that & give me a correct regular expression.

Requirement is :

number of char is between (8,25),
at least one numeric,
at least one upper case,
at least one lower case.

^(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?!.*\s).{8,25}$

By: Steve Brownlee

Steve Brownlee — Thu, 30 Nov 2006 20:42:28 +0000

Well sure, but that takes all the fun out of it! Who doesn’t want a monstrous regex pattern in their code that is hard to comprehend and difficult to change?

Sheesh, Barney, you don’t have to get all logical on me here, and I just thought of the one and only time that using the regex pattern is easier… if you store your patterns in a database. No need to ask why one would do that, I have no idea, but IT COULD HAPPEN.

Anyway, you’re absolutely right and I said as much when I posted the solution in the CF-Talk thread that using multiple conditions is far easier.

By: Barney

Barney — Thu, 30 Nov 2006 17:21:55 +0000

While I know that the point here was to exercise regular expressions, surely a couple simple tests applied in sequence would be a better solution:

len(string) GTE 6 AND len(string LTE 12 AND REFindNoCase(“[^a-z0-9]“, string) EQ 0 AND REFind(“[0-9]“, string) GT 0

Not only is that readable, but changing something (like enforcing both upper and lowercase letters) is far simpler.