Solved

PHP preg_match validation

Posted on 2010-11-27
10
442 Views
Last Modified: 2012-06-27
I need a preg_match to make sure it starts with a letter and a max of 8 characters this is for a WHMCS validation.
0
Comment
Question by:zskull88
[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
  • 4
10 Comments
 
LVL 110

Expert Comment

by:Ray Paseur
ID: 34223644
Untested code, but probably OK in principle:

function validate($str, $len=8)
{
    if (strlen($str) > $len) return FALSE;
    if (!preg_match('/a-z/i', substr($str,0,1)) return FALSE;
    return TRUE;
}
0
 
LVL 110

Expert Comment

by:Ray Paseur
ID: 34223649
Is this the "WHMCS"
http://www.whmcs.com/
0
 

Author Comment

by:zskull88
ID: 34223662
Yes it is Ray.
0
Technology Partners: 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!

 

Author Comment

by:zskull88
ID: 34223663
Also it needs to allow numbers if possible and caps.
0
 
LVL 110

Expert Comment

by:Ray Paseur
ID: 34224002
"... allow numbers if possible and caps."

How?  Please post your test data set including valid and invalid examples so we can see how you expect to process these.  Show us what examples you have for both the good and bad values, then we can show you how to test/select.

Thanks, ~Ray
0
 

Author Comment

by:zskull88
ID: 34224142
/^[a-z0-9]{2,8}$/i is what I have now for whmcs you can test it on https://billing.pingpulse-servers.com/cart.php?a=add&pid=111
0
 

Author Comment

by:zskull88
ID: 34224148
As you can see with 0asdasd1 as username it is valid and it can't start with a number. and this will only work on username field.
0
 

Author Comment

by:zskull88
ID: 34224174
Ray i think this does it so it works for me at least pleae confirm /^[a-z]|[0-9]{2,8}$/i
0
 
LVL 18

Assisted Solution

by:Sudaraka Wijesinghe
Sudaraka Wijesinghe earned 100 total points
ID: 34224312
I think what you are looking for is /^[a-z]{1}[a-z0-9]{7}$/i
If you want to allow any character after the first, replace [a-z0-9] with .
0
 
LVL 110

Accepted Solution

by:
Ray Paseur earned 400 total points
ID: 34225718
Just a thought... Learn about TDD.  It will save you a lot of time if you set up your test data - both valid and invalid - before you start trying to write the code.
<?php // RAY_temp_zskull88.php
error_reporting(E_ALL);

$regex
= '/'         // REGEX DELIMITER
. '^'         // START OF STRING
. '[a-z]'     // ALPHABETIC
. '{1}'       // ONE CHARACTER REQUIRED
. '[a-z0-9]'  // ALPHANUMERIC
. '{0,7}'     // ZERO TO SEVEN CHARACTERS REQUIRED
. '$'         // END OF STRING
. '/'         // END OF REGEX DELIMITER
. 'i'         // CASE -INSENSITIVE
;

$valid
= array
( 'A'
, 'A1'
, 'ABCDEFGH'
, 'Z999'
)
;

$bogus
= array
( '31'
, 'A Blank'
, 'muchTooLongForTheRegex'
, NULL
, 'Punc?'
)
;

echo '<br/>TEST FOR VALID';
foreach ($valid as $string)
{
    if (preg_match($regex, $string)) echo "<br/>VALID: $string";
    if (!preg_match($regex, $string)) echo "<br/>BOGUS: $string";
}

echo '<br/>TEST FOR BOGUS';
foreach ($bogus as $string)
{
    if (preg_match($regex, $string)) echo "<br/>VALID: $string";
    if (!preg_match($regex, $string)) echo "<br/>BOGUS: $string";
}

Open in new window

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

Title # Comments Views Activity
php error 27 61
Put POST values into cookies. 14 35
Compiling PHP with Curl plus protocols 8 26
How can I get the column names from a SELECT statement using PDO? 6 28
Author Note: Since this E-E article was originally written, years ago, formal testing has come into common use in the world of PHP.  PHPUnit (http://en.wikipedia.org/wiki/PHPUnit) and similar technologies have enjoyed wide adoption, making it possib…
This article discusses four methods for overlaying images in a container on a web page
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…
The viewer will learn how to create and use a small PHP class to apply a watermark to an image. This video shows the viewer the setup for the PHP watermark as well as important coding language. Continue to Part 2 to learn the core code used in creat…

730 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