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`10.1016/S0140-6736(16)30370-1` came back as `10.1016/s0140-6736` — a different DOI, and one that resolves, so nothing downstream could tell. The pattern excluded brackets to keep the ones a sentence wraps round a DOI, and Elsevier alone publishes hundreds of thousands of DOIs that contain them. Brackets are taken now, and an unbalanced closer at the end is given back: `(10.1234/foo)` in a sentence ends on a bracket the sentence opened, and `10.1016/S0140-6736(16)30370-1` ends on digits with a matched pair in the middle. Counting is what tells them apart. Found by comparing idnorm against policy-pipeline's own DOI normaliser over 229,556 real documents.