Pith Number

pith:HFZGEUH5

pith:2026:HFZGEUH5AAJ43PAEK53P3TONPD

not attested not anchored not stored refs pending

Selective Memoization for Efficient Backtracking Regular Expression Matching

Brink van der Merwe (Stellenbosch University), Iain le Roux (Stellenbosch University), Martin Berglund (Ume{\aa} University)

arxiv:2606.26678 v1 · 2026-06-25 · cs.FL

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HFZGEUH5AAJ43PAEK53P3TONPD}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-06-26T01:15:56.612568Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

39726250fd0013cdbc045776fdcdcd78d91cc1534f0897cb218b65de11358332

Aliases

arxiv: 2606.26678 · arxiv_version: 2606.26678v1 · doi: 10.48550/arxiv.2606.26678 · pith_short_12: HFZGEUH5AAJ4 · pith_short_16: HFZGEUH5AAJ43PAE · pith_short_8: HFZGEUH5

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/HFZGEUH5AAJ43PAEK53P3TONPD \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 39726250fd0013cdbc045776fdcdcd78d91cc1534f0897cb218b65de11358332

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "09c8cee204998717daf3391c954baa503ab47bab18da2ff9c3119fd3adf6e42d",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2026-06-25T07:13:03Z",
    "title_canon_sha256": "d7bb6553136035af8b8a6cf544ef78a161b9fb92b6e0882afd034b922a597078"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2606.26678",
    "kind": "arxiv",
    "version": 1
  }
}