assert_not_nil r, "#{name.inspect} does not match {prefix}\\d+"
assert_equal(prefix, r[1],
"#{name.inspect} was not {#{prefix.inspect} plus digits}")
assert_not_nil r, "#{name.inspect} does not match {prefix}\\d+"
assert_equal(prefix, r[1],
"#{name.inspect} was not {#{prefix.inspect} plus digits}")