cidr-regex 4.1.3: v4

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify cidr-regex.v4 in pkg:npm/cidr-regex@4.1.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/cidr-regex@4.1.3
Demonstrate these symbols/APIs:
  - cidr-regex.v4

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:cbd46e7d6b4940f8e63533a799385de39a60886330177a776e8eb9770e1de131","contract":["cidrRegex.v4 is exported both as a named export v4 and as a property on the default export cidrRegex","cidrRegex.v4({ exact: true }) returns a non-global RegExp that matches valid IPv4 CIDR strings (prefix 0..32) and rejects out-of-range prefixes, bare IPv4 addresses, IPv6 CIDRs, and substrings","cidrRegex.v4() with default options returns a global RegExp that extracts all IPv4 CIDR substrings while ignoring IPv6 CIDRs"],"goal":"verify cidr-regex.v4 in pkg:npm/cidr-regex@4.1.3","kind":"HOW","packages":["pkg:npm/cidr-regex@4.1.3"],"schemaVersion":1,"symbols":["cidr-regex.v4"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/cidr-regex@4.1.3"],"schemaVersion":1,"subject":"pkg:npm/cidr-regex@4.1.3","symbols":["cidr-regex.v4"],"verifierAdapter":"node-typescript@1"}

{
  "name": "cidr-regex-v4-sample",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "cidr-regex-v4-sample",
      "version": "1.0.0",
      "dependencies": {
        "cidr-regex": "4.1.3"
      }
    },
    "node_modules/cidr-regex": {
      "version": "4.1.3",
      "resolved": "https://registry.npmjs.org/cidr-regex/-/cidr-regex-4.1.3.tgz",
      "integrity": "sha512-86M1y3ZeQvpZkZejQCcS+IaSWjlDUC+ORP0peScQ4uEUFCZ8bEQVz7NlJHqysoUb6w3zCjx4Mq/8/2RHhMwHYw==",
      "license": "BSD-2-Clause",
      "dependencies": {
        "ip-regex": "^5.0.0"
      },
      "engines": {
        "node": ">=14"
      }
    },
    "node_modules/ip-regex": {
      "version": "5.0.0",
      "resolved": "https://registry.npmjs.org/ip-regex/-/ip-regex-5.0.0.tgz",
      "integrity": "sha512-fOCG6lhoKKakwv+C6KdsOnGvgXnmgfmp0myi3bcNwj3qfwPAxRKWEuFhvEFF7ceYIz6+1jRZ+yguLFAmUNPEfw==",
      "license": "MIT",
      "engines": {
        "node": "^12.20.0 || ^14.13.1 || >=16.0.0"
      },
      "funding": {
        "url": "https://github.com/sponsors/sindresorhus"
      }
    }
  }
}

{
  "name": "cidr-regex-v4-sample",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "dependencies": {
    "cidr-regex": "4.1.3"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify cidr-regex.v4 in pkg:npm/cidr-regex@4.1.3",
  "kind": "HOW",
  "packages": [
    "pkg:npm/cidr-regex@4.1.3"
  ],
  "symbols": [
    "cidr-regex.v4"
  ]
}

import assert from "node:assert/strict";
import cidrRegex, { v4 } from "cidr-regex";

assert.strictEqual(cidrRegex.v4, v4);

const exactRe = cidrRegex.v4({ exact: true });
assert.ok(exactRe instanceof RegExp);
assert.strictEqual(exactRe.global, false);
assert.strictEqual(exactRe.test("192.0.2.0/24"), true);
assert.strictEqual(exactRe.test("10.0.0.1/32"), true);
assert.strictEqual(exactRe.test("0.0.0.0/0"), true);
assert.strictEqual(exactRe.test("192.0.2.0/33"), false);
assert.strictEqual(exactRe.test("192.0.2.0"), false);
assert.strictEqual(exactRe.test("2001:db8::/32"), false);
assert.strictEqual(exactRe.test("prefix 192.0.2.0/24 suffix"), false);

const globalRe = cidrRegex.v4();
assert.ok(globalRe instanceof RegExp);
assert.strictEqual(globalRe.global, true);
const matches = "Ranges: 192.0.2.0/24, 2001:db8::/32, and 198.51.100.0/25".match(globalRe);
assert.deepStrictEqual(matches, ["192.0.2.0/24", "198.51.100.0/25"]);