Regex Expression

[john1704]

Hi,

I am working on my proxy script again and realized that images can't load directly because they are blocked! Now to get this to work, I need to replace all of those URLs with another one. I have a secondary script that loads an image onto my server, and echos the result. This is what should appear in the proxy.php file:

<img src="http://www.johninteractive.net/proxy/proxyimage.php?url=FULL _URL__OF_IMAGE_HERE

However, I need to get that URL replace with my URL, followed by the FULL_URL_HERE part. Get what I'm saying? I made a regex expression to try to solve this issue:

[^0-9A-Za-z]+[A-Za-z]+(.jpg|.png|.gif|.bmp)

But it doesn't work.

Can somebody tell me a regex code that will replace a full URL of an image (bmp, jpg, png, gif, etc.) with my URL?:

http://www.johninteractive.net/proxy/proxyimage.php?url=ORIGINAL_URL

Thanks.

Here is the proxy.php code:

<form action="proxy.php" method="GET">
<input type="text" name="url" size="40" value="Enter URL here"><br>
<input type="submit" value="Browse Anonymously"><hr>
</form>
<?php
$url = $_GET['url'];
$sourcecode = file_get_contents($url);
function trueUrl($text, $url) 
{ 
   $search = array( 
      '#((?:href|src)=(["\']))(/.*)(?:\2)#isU', 
      '#((?:href|src)=(["\']))([^/][^:]*)(?:\2)#isU' 
   ); 
   $replace = array( 
      '\1'.array_shift(preg_split('#(?<!/)/(?!/)#', $url)).'\3\2', 
      '\1'.dirname($url).'/\3\2' 
   ); 
   return(preg_replace($search, $replace, $text)); 
} 
trueUrl($sourcecode, $url);
$pattern = "/[^a-z]+[a-z]+(.jpg|.png|.gif|.bmp)/";
$replacement = "http://www.johninteractive.net/proxy/proxyimage.php?url=$0";
preg_replace($pattern, $replacement, $sourcecode);
echo $sourcecode;
?>

Here is the proxyimage.php file:

<?php
$url = $_GET['url'];
$handle = imagecreatefromgd($url);
header("Content-type: image/jpg");
imagejpg($handle);
imagedestroy($handle);
?>

[halojoy]

I see.

What do we look for?
a. 1 char that is not [^A-Za-z0-9]
b. 1 or more chars that is [A-Za-z0-9]
c. an extension [.jpg|.png|.gif|.bmp]
- we want to catch b+c

\w = [A-Za-z0-9_]
+ = 1 or more

Gives me:
^\w

A fair warning!
I am, right now, below average in using regex.
But no need to worry, john1704.
There are a great number of members here, for which this case is just a child's game.
They will soon give us the correct answer.
😃

[john1704]

Specifically, I need anything that replaces a full image URL with my URL. For example, instead of this sample:

http://www.example.org/image.gif

It needs to be this:

http://www.johninteractive.net/proxy/proxyimage.php?url=http://www.example.org/image.gif

How would I do this? Your regex expression didn't work, but thanks for trying!

[halojoy]

A few details to fix.
There may be more things to change before it works.
For example I have no idea if your function trueUrl() does its job.
Actually, I do not know what that function should be doing .....

<?php

error_reporting( E_ALL ); // for DEBUG we want many notices from PHP

if( isset($_GET['url') ){

function trueUrl($text, $url)
{
   $search = array(
      '#((?:href|src)=(["\']))(/.*)(?:\2)#isU',
      '#((?:href|src)=(["\']))([^/][^:]*)(?:\2)#isU'
   );
   $replace = array(
      '\1'.array_shift(preg_split('#(?<!/)/(?!/)#', $url)).'\3\2',
      '\1'.dirname($url).'/\3\2'
   );
   return preg_replace($search, $replace, $text);
}

// start
$url = $_GET['url'];
$sourcecode = file_get_contents($url);
//echo $sourcecode; exit(); // uncomment for debug, see result

$code1 = trueUrl($sourcecode, $url);
//echo $code1; exit(); // uncomment for debug, see result

$pattern = "/[^a-z]+[a-z]+(.jpg|.png|.gif|.bmp)/";
$replacement = "http://www.johninteractive.net/proxy/proxyimage.php?url=$0";
$code2 = preg_replace($pattern, $replacement, $code1);

// display and stop script
echo $code2;
exit();

}
?>
<form action="proxy.php" method="GET">
<input type="text" name="url" size="50" value="Enter URL here"><br>
<input type="submit" value="Browse Anonymously">
</form>

[john1704]

I got the function from another user on this forum.

See, the job of trueUrl() is to replace partial URLs with their full version. Example:

<img src="image.gif">

Should be replace with:

<img src="http://www.example.org/image.gif">

But it isn't exactly doing what it's supposed to be doing.

Instead of replacing it with the true URL, it's replacing it with my domain:

<img src="http://www.johninteractive.net/image.gif">

which isn't correct. Can you fix this, and write me a regex expression like I stated earlier:

john1704 wrote:

Specifically, I need anything that replaces a full image URL with my URL. For example, instead of this sample:

http://www.example.org/image.gif

It needs to be this:

http://www.johninteractive.net/proxy/proxyimage.php?url=http://www.example.org/image.gif

How would I do this? Your regex expression didn't work, but thanks for trying!

If you did, I WOULD REALLY APPRECIATED IT. 🙂

[NogDog]

Untested:

preg_replace(
   '#(<img\s[^>]*src=)([\'"])([^\'"]*)(\2[^>]*>)#i',
   '\\1\\2http://www.johninteractive.net/proxy/proxyimage.php?url=\\3\\4',
   $string
);

[john1704]

Test my proxy.

http://www.johninteractive.net/proxy/proxy.php

Type in a URL of a webpage that you know has images. Right click on the picture and click "Properties." See how the URL looks like it shouldn't? Can you fix it?

Here is the code:

<form action="proxy.php" method="GET">
<input type="text" name="url" size="40" value="Enter URL here"><br>
<input type="submit" value="Browse Anonymously"><hr>
</form>
<?php
$url = $_GET['url'];
$sourcecode = file_get_contents($url);
function trueUrl($text, $url) 
{ 
   $search = array( 
      '#((?:href|src)=(["\']))(/.*)(?:\2)#isU', 
      '#((?:href|src)=(["\']))([^/][^:]*)(?:\2)#isU' 
   ); 
   $replace = array( 
      '\1'.array_shift(preg_split('#(?<!/)/(?!/)#', $url)).'\3\2', 
      '\1'.dirname($url).'/\3\2' 
   ); 
   return(preg_replace($search, $replace, $text)); 
} 
trueUrl($sourcecode, $url);
preg_replace( 
   '#(<img\s[^>]*src=)([\'"])([^\'"]*)(\2[^>]*>)#i', 
   '\\1\\2http://www.johninteractive.net/proxy/proxyimage.php\?url=\\3\\4', 
   $string 
); 
echo $sourcecode;
?>

[halojoy]

Why dont you have a look at my code
in my last post
with some fixes and some DEBUG options?

If you dont consider my advice, why should I try to help
🙂

[NogDog]

You need to assign the result of the preg_replace() call to a variable, or else output it directly. Also, you need to change the 3rd parameter ("$string" in my sample code) to whatever variable you actually want to modify search/replace.

[john1704]

Ok, I've started over from scratch and downloaded a program to help me. It's called RegexBuddy, but I am still struggling over how to get this to work. It uses a lot of unfamiliar terms.

Here is my code:

<?php
$url = $_GET['url'];
$sourcecode = file_get_contents($url);
function trueUrl($text, $url) 
{ 
   $search = array( 
      '#((?:href|src)=(["\']))(/.*)(?:\2)#isU', 
      '#((?:href|src)=(["\']))([^/][^:]*)(?:\2)#isU' 
   ); 
   $replace = array( 
      '\1'.array_shift(preg_split('#(?<!/)/(?!/)#', $url)).'\3\2', 
      '\1'.dirname($url).'/\3\2' 
   ); 
   return(preg_replace($search, $replace, $text)); 
} 
preg_match('@^(?:http://)?([^/]+)@i',
    $sourcecode, $matches);
$host = $matches[1];
$replaceaddress = preg_replace("/[a-z]+(.png|.jpg|.gif|.bmp)/", "http://www.johninteractive.net/proxy/proxyimage.php?url=http://" . $host . "/$0", $sourcecode);
echo $replaceaddress;
?>

Run this on my proxy (Click here for proxy):

http://www.johninteractive.net/experiments/proxytest.html

As you can see, there is a single image on the page. Now look at it, it's a red X. Look at the URL of the picture. See how it's messed up?

I'm trying to replace a full image URL with http://www.johninteractive.net/proxy/proxyimage.php?url=URL_HERE

but it's not working. Anybody care to help? I know I'm being a total n00b but Yahoo! Answers wasn't a big help either.

[john1704]

Scratch that last post. Here is the real code:

<?php 
$url = $_GET['url']; 
$sourcecode = file_get_contents($url); 
function trueUrl($text, $url) 
{ 
   $search = array( 
      '#((?:href|src)=(["\']))(/.*)(?:\2)#isU', 
      '#((?:href|src)=(["\']))([^/][^:]*)(?:\2)#isU' 
   ); 
   $replace = array( 
      '\1'.array_shift(preg_split('#(?<!/)/(?!/)#', $url)).'\3\2', 
      '\1'.dirname($url).'/\3\2' 
   ); 
   return(preg_replace($search, $replace, $text)); 
} 
preg_match('@^(?:http://)?([^/]+)@i', 
    $url, $matches); 
$host = $matches[1]; 
$replaceaddress = preg_replace("/[a-z]+(.png|.jpg|.gif|.bmp)/", "http://www.johninteractive.net/proxy/proxyimage.php?url=http://" . $host . "/$0", $sourcecode); 
$replaceaddress .= preg_replace("/[a-z]+.[a-z]+(.png|.jpg|.gif|.bmp)/", "http://www.johninteractive.net/proxy/proxyimage.php?url=http://" . $host . "/$0", $sourcecode); 
echo $replaceaddress; 
?>