exec xurls -h
! stderr 'flag provided but not defined'
stderr 'Usage: xurls'
! stderr 'help requested' # don't duplicate usage output
! stderr '-test\.' # don't show the test binary's usage func

! exec xurls -r -m="whatever"
stderr 'at the same time'

! exec xurls -m="bad(regexp"
stderr 'missing closing \)'
