Regex help for URL rewriting

Question

I have the following regular expression for rewriting a URL (from existing code which I had to make some quick changes)
String     regex = "s#(href|src|url|action|background)=(\"?)(/|" + "http:originalserver.com" +"/|http.?://" + "originalserver.com"+ ")([^\">]*?)(\"?)#$1=$2" + "myserver.com" + "/$4$5#gis";
which does a URL rewrite and changes the URL from something like
src="http://originalserver.com/images/someimage.gif" to
src="http://myserver.com/proxy/images/someimage.gif"
Now I want to change this regex to add some parameters to the URL. ie.
case 1:
href="http://www.originalserver.com/index.htm"
to
href="http://www.originalserver.com/index.htm?myParam1=myValue1
case 2:
href="http://www.originalserver.com/index.htm?originalP1=originalV1"
to
href="http://www.originalserver.com/index.htm?originalP1=originalV1&myParam1=myValue1"
How can I change the regex to do this. As I have to do this fast and not an expert in Regex, any help would be appreciated.

Answer 1

Hi,
try this :
- first set delimiter (? or &) to append your parameters :
char delimiter = '\?';
String myParams = "myParam1=myValue1";
Pattern p = Pattern.compile( "\?" );
Matcher m = p.matcher( url );
if( m.matches() )
delimiter = '\&'; // not sure ampersand needs to be "backslashed"
- then use the modified regex
String regex = "s#(href|src|url|action|background)=(\"?)(/|" + "http:originalserver.com" +"/|http.?://" + "originalserver.com"+ ")([^\">]*?)(\"?)#$1=$2" + "myserver.com" + "/$4$5" + delimiter + myParams + "#gis";