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pulling this stuff up on nature reserves. It will re-root from any of the nodes if left on the ground, and can also produce flowers that never open fully, but still self-fertilise.
We found that goats will eat it, but only after they'd eaten everything else in sight, first.
That's what I was doing too! Although it does normally pull up quite easily, it does help to grab it quite low down otherwise, as you say, it can break and then regrow.
Lat/Lng: 53.8779, -1.4307
OS grid ref: SE375425
YWT Hetchell Wood reserve