De or het vangnetregeling?

The correct Dutch article is:

de vangnetregeling

Rule Words ending in -ing: almost always de. See the rule

How to use vangnetregeling

the vangnetregelingde vangnetregeling
this vangnetregelingdeze vangnetregeling
that vangnetregelingdie vangnetregeling
our vangnetregelingonze vangnetregeling
your vangnetregelingjouw vangnetregeling
every vangnetregelingelke vangnetregeling
which vangnetregeling?welke vangnetregeling?
a big vangnetregeling / the big vangnetregelingeen grote vangnetregeling, de grote vangnetregeling