Solved

Searching for string inside preg_replace/preg_match findings

Posted on 2008-10-22
7
311 Views
Last Modified: 2013-12-13
I have on my website a forum that allows user input with bbcode style tags.
One of my issues recently has been users using CSRF on other pages on my website that aren't protected. And although I've started adding protection to each page, I feel it might be a faster immediate fix to prevent users including the string ".php" in any [img] tags, since the entire section of my website is coded in php.

I currently use the code attached below, but I am at a loss for how to ensure that ".php" does not occur within the tags. My other option is to ensure the extension of the link is a proper image extension. But again, no clue how to proceed.

Any help would be helpful :)
Thanks.
$s = preg_replace("/\[img\]([^\s'\"<>]+?)\[\/img\]/i", "<img style=\"border: none;\" src=\"\\1\" alt=\"img\" />", $s);

Open in new window

0
Comment
Question by:HigherIQ
  • 3
  • 2
  • 2
7 Comments
 
LVL 16

Expert Comment

by:sh0e
ID: 22784423
Does it have to be done in one line?  
Couldn't you just add another line to preg_replace .php with nothing?

$s = preg_replace("/\.php/ig", "");

Open in new window

0
 
LVL 16

Expert Comment

by:sh0e
ID: 22784430
typo
$s = preg_replace("/\.php/ig", "", $s);

Open in new window

0
 

Author Comment

by:HigherIQ
ID: 22784602
Unfortunately not, as the forum itself often references pages throughout the website with links etc.
I cannot just remove the ".php" from the whole text, as someone with an image may also have a valid link, and reason to have ".php" in the rest of the forum post.
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!

 
LVL 27

Accepted Solution

by:
ddrudik earned 500 total points
ID: 22785326

$s = preg_replace("/\[img\]((?:(?!\.php)[^\s'\"<>])+?)\[\/img\]/i", "<img style=\"border: none;\" src=\"\\1\" alt=\"img\" />", $s);

Open in new window

0
 

Author Comment

by:HigherIQ
ID: 22788378
ddrudik, that is absolutely perfect. I can now view it to see how it's used as well.

Thanks a lot :)
0
 
LVL 27

Expert Comment

by:ddrudik
ID: 22788553
Glad I could help.
0
 
LVL 27

Expert Comment

by:ddrudik
ID: 22789349
Thanks for the question and the points.
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Inserting results of While loop to sql server 5 38
PHP mail() function not working... 8 34
MySQL Persistent Connections 10 35
How do use '  ' within this code? 4 28
Password hashing is better than message digests or encryption, and you should be using it instead of message digests or encryption.  Find out why and how in this article, which supplements the original article on PHP Client Registration, Login, Logo…
This article discusses how to create an extensible mechanism for linked drop downs.
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 a basic form using some HTML5 and PHP for later processing. Set up your basic HTML file. Open your form tag and set the method and action attributes.: (CODE) Set up your first few inputs one for the name and …

749 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