{
  "_args": [
    [
      "regex-cache@https://registry.npmjs.org/regex-cache/-/regex-cache-0.4.3.tgz",
      "D:\\work\\3\\s"
    ]
  ],
  "_from": "regex-cache@>=0.4.2 <0.5.0",
  "_id": "regex-cache@0.4.3",
  "_inCache": true,
  "_location": "/regex-cache",
  "_phantomChildren": {},
  "_requested": {
    "name": "regex-cache",
    "raw": "regex-cache@https://registry.npmjs.org/regex-cache/-/regex-cache-0.4.3.tgz",
    "rawSpec": "https://registry.npmjs.org/regex-cache/-/regex-cache-0.4.3.tgz",
    "scope": null,
    "spec": "https://registry.npmjs.org/regex-cache/-/regex-cache-0.4.3.tgz",
    "type": "remote"
  },
  "_requiredBy": [
    "/micromatch"
  ],
  "_resolved": "https://registry.npmjs.org/regex-cache/-/regex-cache-0.4.3.tgz",
  "_shasum": "9b1a6c35d4d0dfcef5711ae651e8e9d3d7114145",
  "_shrinkwrap": null,
  "_spec": "regex-cache@https://registry.npmjs.org/regex-cache/-/regex-cache-0.4.3.tgz",
  "_where": "D:\\work\\3\\s",
  "author": {
    "name": "Jon Schlinkert",
    "url": "https://github.com/jonschlinkert"
  },
  "bugs": {
    "url": "https://github.com/jonschlinkert/regex-cache/issues"
  },
  "dependencies": {
    "is-equal-shallow": "^0.1.3",
    "is-primitive": "^2.0.0"
  },
  "description": "Memoize the results of a call to the RegExp constructor, avoiding repetitious runtime compilation of the same string and options, resulting in suprising performance improvements.",
  "devDependencies": {
    "benchmarked": "^0.1.5",
    "chalk": "^1.1.3",
    "gulp-format-md": "^0.1.7",
    "micromatch": "^2.3.7",
    "should": "^8.3.0"
  },
  "engines": {
    "node": ">=0.10.0"
  },
  "files": [
    "index.js"
  ],
  "homepage": "https://github.com/jonschlinkert/regex-cache",
  "keywords": [
    "cache",
    "expression",
    "regex",
    "regexp",
    "regular",
    "regular expression",
    "store",
    "to-regex"
  ],
  "license": "MIT",
  "main": "index.js",
  "name": "regex-cache",
  "optionalDependencies": {},
  "readme": "# regex-cache [![NPM version](https://img.shields.io/npm/v/regex-cache.svg?style=flat)](https://www.npmjs.com/package/regex-cache) [![NPM downloads](https://img.shields.io/npm/dm/regex-cache.svg?style=flat)](https://npmjs.org/package/regex-cache) [![Build Status](https://img.shields.io/travis/jonschlinkert/regex-cache.svg?style=flat)](https://travis-ci.org/jonschlinkert/regex-cache)\n\n> Memoize the results of a call to the RegExp constructor, avoiding repetitious runtime compilation of the same string and options, resulting in suprising performance improvements.\n\n## Install\n\nInstall with [npm](https://www.npmjs.com/):\n\n```sh\n$ npm install regex-cache --save\n```\n\n* Read [what this does](#what-this-does).\n* See [the benchmarks](#benchmarks)\n\n## Usage\n\nWrap a function like this:\n\n```js\nvar cache = require('regex-cache');\nvar someRegex = cache(require('some-regex-lib'));\n```\n\n**Caching a regex**\n\nIf you want to cache a regex after calling `new RegExp()`, or you're requiring a module that returns a regex, wrap it with a function first:\n\n```js\nvar cache = require('regex-cache');\n\nfunction yourRegex(str, opts) {\n  // do stuff to str and opts\n  return new RegExp(str, opts.flags);\n}\n\nvar regex = cache(yourRegex);\n```\n\n## Recommendations\n\n### Use this when...\n\n* **No options are passed** to the function that creates the regex. Regardless of how big or small the regex is, when zero options are passed, caching will be faster than not.\n* **A few options are passed**, and the values are primitives. The limited benchmarks I did show that caching is beneficial when up to 8 or 9 options are passed.\n\n### Do not use this when...\n\n* **The values of options are not primitives**. When non-primitives must be compared for equality, the time to compare the options is most likely as long or longer than the time to just create a new regex.\n\n### Example benchmarks\n\nPerformance results, with and without regex-cache:\n\n```bash\n# no args passed (defaults)\n  with-cache x 8,699,231 ops/sec ±0.86% (93 runs sampled)\n  without-cache x 2,777,551 ops/sec ±0.63% (95 runs sampled)\n\n# string and six options passed\n  with-cache x 1,885,934 ops/sec ±0.80% (93 runs sampled)\n  without-cache x 1,256,893 ops/sec ±0.65% (97 runs sampled)\n\n# string only\n  with-cache x 7,723,256 ops/sec ±0.87% (92 runs sampled)\n  without-cache x 2,303,060 ops/sec ±0.47% (99 runs sampled)\n\n# one option passed\n  with-cache x 4,179,877 ops/sec ±0.53% (100 runs sampled)\n  without-cache x 2,198,422 ops/sec ±0.47% (95 runs sampled)\n\n# two options passed\n  with-cache x 3,256,222 ops/sec ±0.51% (99 runs sampled)\n  without-cache x 2,121,401 ops/sec ±0.79% (97 runs sampled)\n\n# six options passed\n  with-cache x 1,816,018 ops/sec ±1.08% (96 runs sampled)\n  without-cache x 1,157,176 ops/sec ±0.53% (100 runs sampled)\n\n# \n# diminishing returns happen about here\n# \n\n# ten options passed\n  with-cache x 1,210,598 ops/sec ±0.56% (92 runs sampled)\n  without-cache x 1,665,588 ops/sec ±1.07% (100 runs sampled)\n\n# twelve options passed\n  with-cache x 1,042,096 ops/sec ±0.68% (92 runs sampled)\n  without-cache x 1,389,414 ops/sec ±0.68% (97 runs sampled)\n\n# twenty options passed\n  with-cache x 661,125 ops/sec ±0.80% (93 runs sampled)\n  without-cache x 1,208,757 ops/sec ±0.65% (97 runs sampled)\n\n# \n# when non-primitive values are compared\n# \n\n# single value on the options is an object\n  with-cache x 1,398,313 ops/sec ±1.05% (95 runs sampled)\n  without-cache x 2,228,281 ops/sec ±0.56% (99 runs sampled)\n```\n\n## Run benchmarks\n\nInstall dev dependencies:\n\n```bash\nnpm i -d && npm run benchmarks\n```\n\n## What this does\n\nIf you're using `new RegExp('foo')` instead of a regex literal, it's probably because you need to dyamically generate a regex based on user options or some other potentially changing factors.\n\nWhen your function creates a string based on user inputs and passes it to the `RegExp` constructor, regex-cache caches the results. The next time the function is called if the key of a cached regex matches the user input (or no input was given), the cached regex is returned, avoiding unnecessary runtime compilation.\n\nUsing the RegExp constructor offers a lot of flexibility, but the runtime compilation comes at a price - it's slow. Not specifically because of the call to the RegExp constructor, but **because you have to build up the string before `new RegExp()` is even called**.\n## Contributing\n\nPull requests and stars are always welcome. For bugs and feature requests, [please create an issue](https://github.com/jonschlinkert/regex-cache/issues/new).\n\n## Building docs\n\nGenerate readme and API documentation with [verb](https://github.com/verbose/verb):\n\n```sh\n$ npm install verb && npm run docs\n```\n\nOr, if [verb](https://github.com/verbose/verb) is installed globally:\n\n```sh\n$ verb\n```\n\n## Running tests\n\nInstall dev dependencies:\n\n```sh\n$ npm install -d && npm test\n```\n\n## Author\n\n**Jon Schlinkert**\n\n* [github/jonschlinkert](https://github.com/jonschlinkert)\n* [twitter/jonschlinkert](http://twitter.com/jonschlinkert)\n\n## License\n\nCopyright © 2016, [Jon Schlinkert](https://github.com/jonschlinkert).\nReleased under the [MIT license](https://github.com/jonschlinkert/regex-cache/blob/master/LICENSE).\n\n***\n\n_This file was generated by [verb](https://github.com/verbose/verb), v, on April 01, 2016._",
  "readmeFilename": "README.md",
  "repository": {
    "type": "git",
    "url": "git+https://github.com/jonschlinkert/regex-cache.git"
  },
  "scripts": {
    "benchmarks": "node benchmark",
    "test": "mocha"
  },
  "verb": {
    "layout": "default",
    "lint": {
      "reflinks": true
    },
    "plugins": [
      "gulp-format-md"
    ],
    "reflinks": [
      "verb"
    ],
    "run": true,
    "tasks": [
      "readme"
    ],
    "toc": false
  },
  "version": "0.4.3"
}
