An interesting challenge was posted last 9/11 [
webmasterworld.com ]. In that brief exchange, lucy24 hammered home some
pretty sophisticated suggestions, which at first made me giddy. But they were good. ;)
OP, however, perhaps unsurprisingly, was last seen heading for the hills. No proper resolution has come out of that thread, to the eternal frustration of countless WebmasterWorld visitors, I've no doubt. This was a question that cried for a solution. Here, if I may, I'd like to offer my own PHP 5.2 mashup.
To paraphrase the original example:
$string = "Lots of text then this bad
and then this OK
more text";
$pattern = "/\[img\]http:\/\/(example\.com).+?\[\/img\]/im";
$replacement = '[Images from ${1} not allowed]';
$result = preg_replace( $pattern, $replacement, $string );
echo $result;
It's just a testable example. Don't expect it to revolutionize your site without a bit more effort on your part. Btw, the '/im' modifiers make it case-insensitive and multi-line, so an entire comment, with newlines, can be fed through it.
I needed to flush this. Now I can die in peace.
