Programming Forums - regex (preg

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regex (preg_replace) parsing

I'm trying to replace certain occurances of a substring within certain substrings of a string.
For example, if I have the string:

"blah1 blah2 blah3 <pre>asdf 123 </pre> blah4 blah5 blah6"

I would like to be able to use a preg_replace() call to change this to:

"blah1 blah2 blah3 <pre>asdf123</pre> blah4 blah5 blah6"

Where, in this example, 's are removed, but only within <pre> blocks. Is this possible?

I'm not so great a PHP, and worse at regex; I came up with something like..

$str = preg_replace("/<pre>(.*) <\/pre>/", "<pre>$1</pre>", $str);

But it doesn't exactly work correctly. I'm sure this is far from what I want to :(

Might anyone be regex gurus?

Maybe you should take advantage of preg_replace_callback:
[PHP]function remove_br_tags($matches) {
return preg_replace("/ /", "", $matches[0]);
}

$str = "blah1 blah2 blah3 <pre>asdf 123 </pre> blah4 blah5 blah6";

$str = preg_replace_callback("/<pre>.*?<\/pre>/", "remove_br_tags", $str);[/PHP]

Thanks, worked great. :)