preg_replace help!

Wingee

Hi I'm trying to use preg_replace and I'm a little unclear about it - I'm a bit confused by how it works!

I have a string with HTML in it. What I want to do is strip the image tags from the sting that have a link around them.

E.g. the string is:

<a href="http://www.link.com/" target="_blank"><img src="picture.gif" alt="BLahdy blah" width="300" height="340" border="0"></a>
<img src="picture.gif" alt="BLahdy blah2" width="300" height="340" border="0">

And I want it to output like this:

<a href="http://www.link.com/" target="_blank">BLahdy blah</a>

You'll see that I'm trying to keep the alt tags, and I don't want image tags that don't have a link around them.

Help would be greatly appreciated!

poison

hi
you found the right one to ask about any regexp stuff =)

$data='<a href="http://www.link.com/" target="_blank"><img src="picture.gif" alt="BLahdy blah" width="300" height="340" border="0"></a>
<img src="picture.gif" alt="BLahdy blah2" width="300" height="340" border="0">';
echo preg_replace('/(<a[^>]+\>\)\\s*?<img[^>]+?alt\\s*?=\\s*?\\"([^\\"]*)[^>]*>\\s*?<\\/a>/ism', '$1$2</a>', $data);

output: '<a href="http://www.link.com/" target="_blank">BLahdy blah</a>
<img src="picture.gif" alt="BLahdy blah2" width="300" height="340" border="0">'

like this ?
regards =D

NOTE: posting a regexp here is much much harder than designing it

Wingee

Umm that doesn't work for me - I get nothing back, it's blank!!

Also of course I have further tags before and after my example - will that still work??

Furthermore, if there ISN'T an alt tag, can I put in the word "Link" or something??

Thanks!!

Wingee

Sorry the error is :
Warning: Unknown modifier 'a' in C:\bohica\test.php on line 2

poison

sorry I just teared me hair out ...the regexp code got escaped and not displayed right...
should be fixed now...try again

Wingee

Oh great, thanks. but it leaves the second img tag in - which I don't want as it doesn't have a link around it.
How can I remove those?

Thanks a lot for your help!

poison

just do it in 2 steps:

$data=preg_replace('/(<a[^>]+\>\)\\s*?<img[^>]+?alt\\s*?=\\s*?\\"([^\\"]*)[^>]*>\\s*?<\\/a>/ism', '$1$2</a>', $data);
$data=preg_replace('/(<img[^\>]+?\>\)/ism', '', $data);
echo $data;

Wingee

Ahh OK (-; makes sense.

One final thing then is, if there is no alt tag, how can I replace the img with the word "Link"??

So for example:

<a href="http://www.link.com/" target="_blank"><img src="picture.gif" alt="BLahdy blah" width="300" height="340" border="0"></a>
<a href="http://www.link.com/" target="_blank"><img src="picture.gif" width="300" height="340" border="0"></a>

would return

<a href="http://www.link.com/" target="_blank">BLahdy blah></a>
<a href="http://www.link.com/" target="_blank">Link</a>

Thanks again!

poison

$data='<a href="http://www.link.com/" target="_blank"><img src="picture.gif" alt="BLahdy blah" width="300" height="340" border="0"></a>
<a href="http://www.link.com/" target="_blank"><img src="picture.gif" width="300" height="340" border="0"></a>
<img src="picture.gif" alt="BLahdy blah2" width="300" height="340" border="0">';

// replace all with an alt tag
$data=preg_replace('/(<a[^>]+\>\)\\s*?<img[^>]+?alt\\s*?=\\s*?\\"([^\\"]*)[^>]*>\\s*?<\\/a>/ism', '$1$2</a>', $data);
// since the first one doesn't match ones without an alt tag...here we go
$data=preg_replace('/(<a[^>]+\>\)\\s*?<img[^>]+?>\\s*?<\\/a>/ism', '$1Link</a>', $data);
// kill the rest of the images...
$data=preg_replace('/(<img[^\>]+?\>\)/ism', '', $data);
echo $data;

output: '<a href="http://www.link.com/" target="blank">BLahdy blah</a>
<a href="http://www.link.com/" target="blank">Link</a>'

have fun

laserlight

poison, I think the [php] bbcode tags have a tendency to go the extra (unwanted) mile.

If I remember correctly, using the normal [code] bbcode tag is better for regex.

poison

If I remember correctly, using the normal bbcode tag is better for regex.

thanks for the tip...i'll try next time

Wingee

Hiya, just one more thing (-:

Tomorrow I'm definately gonna read up on regular expressions and learn them!!

So basically I've got an HTML page in a string - there are no FONT tags around the text, but I want to put font tags around them. How can I go through the string and do that?
The text don't have any tags around them.

Hope you can help!!

poison

if your a little more precise....maybe