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  "license": "MIT",
  "main": "rewrite-pattern.js",
  "maintainers": [
    {
      "name": "mathias",
      "email": "mathias@qiwi.be"
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  "readme": "# regexpu-core [![Build status](https://travis-ci.org/mathiasbynens/regexpu-core.svg?branch=master)](https://travis-ci.org/mathiasbynens/regexpu-core) [![Code coverage status](http://img.shields.io/coveralls/mathiasbynens/regexpu-core/master.svg)](https://coveralls.io/r/mathiasbynens/regexpu-core) [![Dependency status](https://gemnasium.com/mathiasbynens/regexpu-core.svg)](https://gemnasium.com/mathiasbynens/regexpu-core)\n\n_regexpu_ is a source code transpiler that enables the use of ES6 Unicode regular expressions in JavaScript-of-today (ES5).\n\n_regexpu-core_ contains _regexpu_’s core functionality, i.e. `rewritePattern(pattern, flag)`, which enables rewriting regular expressions that make use of [the ES6 `u` flag](https://mathiasbynens.be/notes/es6-unicode-regex) into equivalent ES5-compatible regular expression patterns.\n\n## Installation\n\nTo use _regexpu-core_ programmatically, install it as a dependency via [npm](https://www.npmjs.com/):\n\n```bash\nnpm install regexpu-core --save-dev\n```\n\nThen, `require` it:\n\n```js\nconst rewritePattern = require('regexpu-core');\n```\n\n## API\n\nThis module exports a single function named `rewritePattern`.\n\n### `rewritePattern(pattern, flags)`\n\nThis function takes a string that represents a regular expression pattern as well as a string representing its flags, and returns an ES5-compatible version of the pattern.\n\n```js\nrewritePattern('foo.bar', 'u');\n// → 'foo(?:[\\\\0-\\\\t\\\\x0B\\\\f\\\\x0E-\\\\u2027\\\\u202A-\\\\uD7FF\\\\uDC00-\\\\uFFFF]|[\\\\uD800-\\\\uDBFF][\\\\uDC00-\\\\uDFFF]|[\\\\uD800-\\\\uDBFF])bar'\n\nrewritePattern('[\\\\u{1D306}-\\\\u{1D308}a-z]', 'u');\n// → '(?:[a-z]|\\\\uD834[\\\\uDF06-\\\\uDF08])'\n\nrewritePattern('[\\\\u{1D306}-\\\\u{1D308}a-z]', 'ui');\n// → '(?:[a-z\\\\u017F\\\\u212A]|\\\\uD834[\\\\uDF06-\\\\uDF08])'\n```\n\n_regexpu-core_ can rewrite non-ES6 regular expressions too, which is useful to demonstrate how their behavior changes once the `u` and `i` flags are added:\n\n```js\n// In ES5, the dot operator only matches BMP symbols:\nrewritePattern('foo.bar');\n// → 'foo(?:[\\\\0-\\\\t\\\\x0B\\\\f\\\\x0E-\\\\u2027\\\\u202A-\\\\uFFFF])bar'\n\n// But with the ES6 `u` flag, it matches astral symbols too:\nrewritePattern('foo.bar', 'u');\n// → 'foo(?:[\\\\0-\\\\t\\\\x0B\\\\f\\\\x0E-\\\\u2027\\\\u202A-\\\\uD7FF\\\\uDC00-\\\\uFFFF]|[\\\\uD800-\\\\uDBFF][\\\\uDC00-\\\\uDFFF]|[\\\\uD800-\\\\uDBFF])bar'\n```\n\n`rewritePattern` uses [regjsgen](https://github.com/d10/regjsgen), [regjsparser](https://github.com/jviereck/regjsparser), and [regenerate](https://github.com/mathiasbynens/regenerate) as internal dependencies.\n\n## Author\n\n| [![twitter/mathias](https://gravatar.com/avatar/24e08a9ea84deb17ae121074d0f17125?s=70)](https://twitter.com/mathias \"Follow @mathias on Twitter\") |\n|---|\n| [Mathias Bynens](https://mathiasbynens.be/) |\n\n## License\n\n_regexpu-core_ is available under the [MIT](https://mths.be/mit) license.\n",
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