Regular Expression Problem - PHP

Ok am at my wits end with this one. No luck on google either and feels like am beating my head against a brick wall.

The problem: I have a string containing some HTML source. Within this source there is various links to different locations.

I need to get all the links and append a set of variables to them using a regular expression.

But i need to ensure that the URLs remain properly formed

Examples:

<a href="www.somesite.com">Some Site!</a>
Becomes - <a href="www.somesite.com?var1=foo&var2=bar">Some Site!</a>

<a href="http://www.somesite.com/mydir/index.php?somevar=value" title="A link" class="myLinks">Some Site!</a>
Becomes - <a href="http://www.somesite.com/mydir/index.php?var1=foo&var2=bar&somevar=value" title="A link" class="myLinks">Some Site!</a>

So basically I need to ensure that all other information remains untouched

any help to save me form going nuts would be appriciated

cheers

v_Ln

Heh, you have my sympathies...matching or s/replacing url's can be very very tricky b/c web masters are often sloppy and certainly not consistent...

For example:

href=www.somesite.com/dir/subdir/subdir/../../url
href=www.somesite.com/dir/url
href=www.somesite.com/dir/
href='www.somesite.com/dir'
href="www.somesite.com/dir"
href="www.somesite.com/dir%2fsubdir%2fsubdir%2f%2e%2e%2f%2e%2e%2f"
onClick=document.open('www.somesite.com/dir')

Those are all the same...and I am sure there are tons of other variations...do you have any control over what is being searched/replaced or do you have to take all the millions of little variations into account?

EDIT: Somewhere in addicts I posted a script that would parse through and break down urls...you might look for it (it was perl) and on another site that I think you know what I mean I have an updated ruby version...