This is a small helper I created for myself and colleagues to create names of test/s for maven to rerun them from Jenkins list of failed tests.
Since most of the time I had to copy all failed tests, by hand change this list from something like com.ab.cd.ef.className.fnName to className#fnName so I can rerun with -D by maven, I created a small and stupid website with textarea where you can paste multiple lines of failed tests and the result will be shape that maven expects.
converter to -D format (the app will also copy the new created param to clipboard)
A bit more on the format that Maven needs to run just some tests : Running a Single Test or Method With Maven
Hope this helps.