get the complete string in a line excluding the matching regex - regex

Question

For example, if a value matches "an email pattern", then remove the key also associated to it from the url.
If url is
https://stackoverflow.com/?key1=test&key2=test#gmail.com&key3=something&key4=another#email.com,
then remove key2=test#gmail.com and key4=another#email.com, so that the new url will be
https://stackoverflow.com/?key1=test&key3=something
Here, key names are not fixed and they can be anything. and also the position of the keys is not fixed.
So, want a regex to get the entire string which does not contain those key value pairs. I tried to generate the regex to match the unwanted key value pairs, but could get the rest of the string which does not match the regex.
I did it using a java program. But looking at a regex so that I can apply in the xml and avoid a java program
This is mainly to use in urlrewritefilter (tuckey) and want to remove certain query strings matching a regex.

Answer 1

Here is a simple solution in java (I saw your question is tagged as java). This is basically pattern that matches ? or & followed by a word then a = and then an email. You can substitute that part [.\w]+#[\w]+\.\w+ with a better email regex. Finding email with regex can be tricky with stranger emails but this would be the basic idea.
public class HelloWorld{
public static void main(String []args){
String url="https://stackoverflow.com/?key1=test&key2=test#gmail.com&key3=something&key4=another#email.com";
System.out.println(url.replaceAll("[?&]\\w+=[.\\w]+#[\\w]+\\.\\w+",""));
}
}