Solved

Regular Expression Question

Posted on 2012-03-31
5
295 Views
Last Modified: 2012-04-11
How to make this password reg,. ex. I have had enough problems with this.

*Must contain at least 8 characters.
*Must include a number and a letter.
*No more than two consecutive characters may be the same.


prain
0
Comment
Question by:prain
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
5 Comments
 
LVL 20

Expert Comment

by:thehagman
ID: 37791000
$x =~ /.{8}/ && $x =~ /[a-zA-Z]/ && $x =~ /[0-9]/ && !($x =~ /(.)\1\1/)

Open in new window

0
 
LVL 75

Accepted Solution

by:
käµfm³d   👽 earned 150 total points
ID: 37791074
Try:

^(?=\D*\d)(?=[^a-zA-Z]*[a-zA-Z])(?!.*(.)\1).{8,}$

Open in new window

0
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 37791130
P.S.

I urge you to define your password requirement a bit further. I fashioned the above strictly by the rules you posted. However, the use of the dot allows for even non-printable characters to be used as a part of the password. This means null characters, spaces, newlines, percent signs...  pretty much any character can be used as a part of the password--so long as there are 8 of them. It should be as simple as changing the ".{8,}" part of the pattern to provide further restrictions. For example:

Restrict to Letters and Numbers
^(?=\D*\d)(?=[^a-zA-Z]*[a-zA-Z])(?!.*(.)\1)[a-zA-Z0-9]{8,}$

Open in new window


Restrict to Letters and Numbers and a Few Special Characters
^(?=\D*\d)(?=[^a-zA-Z]*[a-zA-Z])(?!.*(.)\1)[a-zA-Z0-9$#@!]{8,}$

Open in new window

0
 
LVL 2

Expert Comment

by:Codecaesar
ID: 37792589
0
 

Author Closing Comment

by:prain
ID: 37833305
Thanks
0

Featured Post

PeopleSoft Has Never Been Easier

PeopleSoft Adoption Made Smooth & Simple!

On-The-Job Training Is made Intuitive & Easy With WalkMe's On-Screen Guidance Tool.  Claim Your Free WalkMe Account Now

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Problem Hi all,    While many today have fast Internet connection, there are many still who do not, or are connecting through devices with a slower connect, so light web pages and fast load times are still popular.    If your ASP.NET page …
This article will show, step by step, how to integrate R code into a R Sweave document
This video teaches viewers about errors in exception handling.
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.

751 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question