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"safe-regex-2.1.0.tgz": { "url": "https://registry.npmjs.org/safe-regex/-/safe-regex-2.1.0.tgz", "sha": "3c8c4481278b21d030f6272b8c663de6776130ac", "registry": "npmjs" }, "safe-regex-2.1.1.tgz": { "url": "https://registry.npmjs.org/safe-regex/-/safe-regex-2.1.1.tgz", "sha": "f7128f00d056e2fe5c11e81a1324dd974aadced2", "registry": "npmjs" } }, "_attachments": { "safe-regex-1.1.0.tgz": { "shasum": "40a3669f3b077d1e943d44629e157dd48023bf2e" } }, "_rev": "12-2ee21507d2f9762d", "_id": "safe-regex", "readme": "# safe-regex\n\nDetect potentially\n[catastrophic](http://regular-expressions.mobi/catastrophic.html)\n[exponential-time](http://perlgeek.de/blog-en/perl-tips/in-search-of-an-exponetial-regexp.html)\nregular expressions by limiting the\n[star height](https://en.wikipedia.org/wiki/Star_height) to 1.\n\nWARNING: This module has both false positives and false negatives.\nUse [vuln-regex-detector](https://github.com/davisjam/vuln-regex-detector) for improved accuracy.\n\n[![Build Status](https://travis-ci.org/davisjam/safe-regex.svg?branch=master)](https://travis-ci.org/davisjam/safe-regex)\n\n## Example\n\nSuppose you have a script named `safe.js`:\n\n``` js\nvar safe = require('safe-regex');\nvar regex = process.argv.slice(2).join(' ');\nconsole.log(safe(regex));\n```\n\nThis is its behavior:\n\n```\n$ node safe.js '(x+x+)+y'\nfalse\n$ node safe.js '(beep|boop)*'\ntrue\n$ node safe.js '(a+){10}'\nfalse\n$ node safe.js '\\blocation\\s*:[^:\\n]+\\b(Oakland|San Francisco)\\b'\ntrue\n```\n\n## Methods\n\n``` js\nconst safe = require('safe-regex')\n```\n\n### const ok = safe(re, opts={})\n\nReturn a boolean `ok` whether or not the regex `re` is safe and not possibly\ncatastrophic.\n\n`re` can be a `RegExp` object or just a string.\n\nIf the `re` is a string and is an invalid regex, returns `false`.\n\n* `opts.limit` - maximum number of allowed repetitions in the entire regex.\nDefault: `25`.\n\n## Install\n\nWith [npm](https://npmjs.org) do:\n\n```\nnpm install safe-regex\n```\n\n## Resources\n\n### What should I do if my project has a super-linear regex?\n\n1. Confirm that it is *reachable* by untrusted input.\n2. If it is, you can consider whether you can prevent worst-case behavior by trimming the input, revising the regex, or replacing the regex with another algorithm like string functions. For examples, see Table 5 in [this article](http://people.cs.vt.edu/davisjam/downloads/publications/DavisCoghlanServantLee-EcosystemREDOS-ESECFSE18.pdf).\n3. If none of those solutions looks feasible, you might also consider changing regex engines. The [RE2 bindings](https://www.npmjs.com/package/re2) might work, though test carefully to confirm there are no [semantic portability problems](https://medium.com/@davisjam/why-arent-regexes-a-lingua-franca-esecfse19-a36348df3a2?source=friends_link&sk=d21be7f8f723e2080dc993385c6973d1).\n\n### Further reading\n\nThe following documents may be edifying:\n\n- [Research brief on the extent of super-linear regexes in practice](https://medium.com/@davisjam/introduction-987fdc4c7b0?source=friends_link&sk=ceefa4a4ca9617e08ab782c3b1580aea)\n- [Research brief on the variability of super-linear regex behavior across programming languages](https://medium.com/@davisjam/why-arent-regexes-a-lingua-franca-esecfse19-a36348df3a2?source=friends_link&sk=d21be7f8f723e2080dc993385c6973d1)\n- [Comparing regex matching algorithms](https://swtch.com/~rsc/regexp/regexp1.html)\n\n## Project policies\n\n### Versioning\n\nThis project follows [Semantic Versioning 2.0 (semver)](https://semver.org/).\n\nHere are the project-specific meanings of MAJOR, MINOR, and PATCH updates:\n\n- MAJOR: \"Incompatible\" API changes were introduced. There are two types in this module:\n - Changes that modify the interface\n - Changes that cause any regexes to be marked as unsafe that were formerly marked as safe\n- MINOR: Functionality was added in a backwards-compatible manner. There are two types in this module:\n - Refactoring the analyses but not changing their results\n - Modifying the analyses to reduce false positives, without affecting negatives (false or true)\n- PATCH: I don't anticipate using PATCH for this module\n\n### License\n\n[MIT](https://github.com/davisjam/safe-regex/blob/master/LICENSE)" }