Regular expression problem - rewriting of internal links

[tallyce]

I've spent most of the day trying to solve this problem, and much
searching has also failed to find a solution! I wonder if anyone can
suggest a solution?

Basically I need to rewrite all *internal* links on a page to add a
query string to each. For instance,

<a href="/path/to/file.html" target="_blank" >
should become
<a href="/path/to/file.html?edit" target="_blank" >

and

<a href="" target="_blank" >
should become
<a href="?edit" target="_blank" >

but

<a href="http://example.com/path/to/file.html" target="_blank" >
should stay unchanged.


I've tried things like:

$search = '(<a([^>]*) href="(?<!http://)([^"]*)"';
$html = preg_replace ("~{$regexp}~i" , '\1?edit', $html);

but the presence of the [^"]* seems to make the negative look-behind
assertion fail.

Any ideas gratefully received!

[Sjoerd]

Re: Regular expression problem - rewriting of internal links

tallyce wrote:

Basically I need to rewrite all *internal* links on a page to add a
query string to each. [...]
$search = '(<a([^>]*) href="(?<!http://)([^"]*)"'; $html = preg_replace
("~{$regexp}~i" , '\1?edit', $html);
>
but the presence of the [^"]* seems to make the negative look-behind
assertion fail.

Are you sure that you need negative look behind?

Note that your regex does not match these links:
<a title="..." href="...">
<a href='...'>

This seem to work:
preg_replace('| href=[\'"](?!http://)([^\'"]*)[\'"]|',
'href="\1?query =bla"', $page);

This matches href, quote, not starting with http://, zero or more
characters which are not a quote, ended with a quote. Where a quote is '
or ".