Question

I am looking for removing foo parameter and its value from all the possible following query strings in Java.

Is there a regex pattern to do this?

http://localhost/test?foo=abc&foobar=def 
http://localhost/test?foobar=def&foo=abc
http://localhost/test?foo=abc
http://localhost/test?foobar=def&foo=abc&foobar2=def

The resulting strings would be

http://localhost/test?foobar=def 
http://localhost/test?foobar=def
http://localhost/test
http://localhost/test?foobar=def&foobar2=def

Answer 1

This regex should match the GET param and its value…

(?<=[?&;])foo=.*?($|[&;])

RegExr.

Just replace it with an empty string.