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');\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)","maintainers":[{"email":"davisjam@vt.edu","name":"davisjam"}],"time":{"modified":"2019-10-21T19:45:04.555Z","created":"2013-07-13T02:56:00.967Z","0.0.0":"2013-07-13T02:56:02.406Z","0.0.1":"2013-11-22T08:44:01.232Z","1.0.0":"2015-02-06T16:36:31.893Z","1.1.0":"2015-03-19T00:30:21.780Z","2.0.0":"2018-10-26T17:59:46.642Z","2.0.1":"2018-11-02T15:34:25.412Z","2.0.2":"2019-02-25T20:17:25.012Z","2.1.0":"2019-10-21T19:42:27.934Z","2.1.1":"2019-10-21T19:45:01.945Z"},"author":{"name":"James C.","email":"davisjam@vt.edu","url":"Jamie"},"repository":{"type":"git","url":"git://github.com/davisjam/safe-regex.git"},"users":{"julien-f":true,"cilindrox":true,"openam":true,"davidcai":true,"stretchgz":true,"csbun":true,"kobleistvan":true,"disqus":true,"scottfreecode":true,"lonjoy":true,"anchnk":true,"hibrahimsafak":true,"kikar":true,"joseph320":true,"raydog":true,"vishwasc":true,"dpjayasekara":true,"ngpvnk":true,"tkalfigo":true,"donecharlton":true},"homepage":"https://github.com/davisjam/safe-regex","keywords":["catastrophic","exponential","regex","safe","sandbox"],"bugs":{"url":"https://github.com/davisjam/safe-regex/issues"},"license":"MIT","readmeFilename":"README.md","_etag":"W/\"201a48dc9d05931942ca2f132136c75b\"","_lastModified":"Mon, 21 Oct 2019 19:45:05 GMT"}
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