Solved

Regex for username

Posted on 2007-11-29
3
1,257 Views
Last Modified: 2010-04-21
Hello all,

need a pretty simple regex but my head is a bit fuzzy and can't get it working quite right...

what i need is a regex for a user name that accepts a-z, A-Z, 0-9, -, and _ but DOES NOT allow - or _ at the beginning or the end.

I have the first part: /^[a-zA-Z0-9_-]+$/

please help me add the -/_ restriction... thanks!
0
Comment
Question by:bobbit31
[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
  • 2
3 Comments
 
LVL 27

Accepted Solution

by:
ddrudik earned 125 total points
ID: 20377126
Not sure how many characters you want to allow in the name, but here's a possible option:
^[a-zA-Z0-9][a-zA-Z0-9_-]*[a-zA-Z0-9]$
0
 
LVL 18

Author Closing Comment

by:bobbit31
ID: 31411795
works for me... thanks for the fast response!
0
 
LVL 27

Expert Comment

by:ddrudik
ID: 20377211
Thanks for the question and the points.
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

I have been reconstructing a PHP-based application that has grown into a full blown interface system over the last ten years by a developer that has now gone into business for himself building websites. I am not incredibly fond of writing PHP code o…
Whatever be the reason, if you are working on web development side,  you will need day-today validation codes like email validation, date validation , IP address validation, phone validation on any of the edit page or say at the time of registration…
Learn how to match and substitute tagged data using PHP regular expressions. Demonstrated on Windows 7, but also applies to other operating systems. Demonstrated technique applies to PHP (all versions) and Firefox, but very similar techniques will w…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…

726 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