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+# to-regex [![NPM version](https://img.shields.io/npm/v/to-regex.svg?style=flat)](https://www.npmjs.com/package/to-regex) [![NPM monthly downloads](https://img.shields.io/npm/dm/to-regex.svg?style=flat)](https://npmjs.org/package/to-regex) [![NPM total downloads](https://img.shields.io/npm/dt/to-regex.svg?style=flat)](https://npmjs.org/package/to-regex) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/to-regex.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/to-regex)
+
+> Generate a regex from a string or array of strings.
+
+Please consider following this project's author, [Jon Schlinkert](https://github.com/jonschlinkert), and consider starring the project to show your :heart: and support.
+
+- [Install](#install)
+- [Usage](#usage)
+- [Options](#options)
+  * [options.contains](#optionscontains)
+  * [options.negate](#optionsnegate)
+  * [options.nocase](#optionsnocase)
+  * [options.flags](#optionsflags)
+  * [options.cache](#optionscache)
+  * [options.safe](#optionssafe)
+- [About](#about)
+  * [Related projects](#related-projects)
+  * [Author](#author)
+  * [License](#license)
+
+_(TOC generated by [verb](https://github.com/verbose/verb) using [markdown-toc](https://github.com/jonschlinkert/markdown-toc))_
+
+## Install
+
+Install with [npm](https://www.npmjs.com/):
+
+```sh
+$ npm install --save to-regex
+```
+
+## Usage
+
+```js
+var toRegex = require('to-regex');
+
+console.log(toRegex('foo'));
+//=> /^(?:foo)$/
+
+console.log(toRegex('foo', {negate: true}));
+//=> /^(?:(?:(?!^(?:foo)$).)*)$/
+
+console.log(toRegex('foo', {contains: true}));
+//=> /(?:foo)/
+
+console.log(toRegex(['foo', 'bar'], {negate: true}));
+//=> /^(?:(?:(?!^(?:(?:foo)|(?:bar))$).)*)$/
+
+console.log(toRegex(['foo', 'bar'], {negate: true, contains: true}));
+//=> /^(?:(?:(?!(?:(?:foo)|(?:bar))).)*)$/
+```
+
+## Options
+
+### options.contains
+
+**Type**: `Boolean`
+
+**Default**: `undefined`
+
+Generate a regex that will match any string that _contains_ the given pattern. By default, regex is strict will only return true for exact matches.
+
+```js
+var toRegex = require('to-regex');
+console.log(toRegex('foo', {contains: true}));
+//=> /(?:foo)/
+```
+
+### options.negate
+
+**Type**: `Boolean`
+
+**Default**: `undefined`
+
+Create a regex that will match everything except the given pattern.
+
+```js
+var toRegex = require('to-regex');
+console.log(toRegex('foo', {negate: true}));
+//=> /^(?:(?:(?!^(?:foo)$).)*)$/
+```
+
+### options.nocase
+
+**Type**: `Boolean`
+
+**Default**: `undefined`
+
+Adds the `i` flag, to enable case-insensitive matching.
+
+```js
+var toRegex = require('to-regex');
+console.log(toRegex('foo', {nocase: true}));
+//=> /^(?:foo)$/i
+```
+
+Alternatively you can pass the flags you want directly on [options.flags](#options.flags).
+
+### options.flags
+
+**Type**: `String`
+
+**Default**: `undefined`
+
+Define the flags you want to use on the generated regex.
+
+```js
+var toRegex = require('to-regex');
+console.log(toRegex('foo', {flags: 'gm'}));
+//=> /^(?:foo)$/gm
+console.log(toRegex('foo', {flags: 'gmi', nocase: true})); //<= handles redundancy
+//=> /^(?:foo)$/gmi
+```
+
+### options.cache
+
+**Type**: `Boolean`
+
+**Default**: `true`
+
+Generated regex is cached based on the provided string and options. As a result, runtime compilation only happens once per pattern (as long as options are also the same), which can result in dramatic speed improvements.
+
+This also helps with debugging, since adding options and pattern are added to the generated regex.
+
+**Disable caching**
+
+```js
+toRegex('foo', {cache: false});
+```
+
+### options.safe
+
+**Type**: `Boolean`
+
+**Default**: `undefined`
+
+Check the generated regular expression with [safe-regex](https://github.com/substack/safe-regex) and throw an error if the regex is potentially unsafe.
+
+**Examples**
+
+```js
+console.log(toRegex('(x+x+)+y'));
+//=> /^(?:(x+x+)+y)$/
+
+// The following would throw an error
+toRegex('(x+x+)+y', {safe: true});
+```
+
+## About
+
+<details>
+<summary><strong>Contributing</strong></summary>
+
+Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
+
+</details>
+
+<details>
+<summary><strong>Running Tests</strong></summary>
+
+Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
+
+```sh
+$ npm install && npm test
+```
+
+</details>
+
+<details>
+<summary><strong>Building docs</strong></summary>
+
+_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_
+
+To generate the readme, run the following command:
+
+```sh
+$ npm install -g verbose/verb#dev verb-generate-readme && verb
+```
+
+</details>
+
+### Related projects
+
+You might also be interested in these projects:
+
+* [has-glob](https://www.npmjs.com/package/has-glob): Returns `true` if an array has a glob pattern. | [homepage](https://github.com/jonschlinkert/has-glob "Returns `true` if an array has a glob pattern.")
+* [is-glob](https://www.npmjs.com/package/is-glob): Returns `true` if the given string looks like a glob pattern or an extglob pattern… [more](https://github.com/jonschlinkert/is-glob) | [homepage](https://github.com/jonschlinkert/is-glob "Returns `true` if the given string looks like a glob pattern or an extglob pattern. This makes it easy to create code that only uses external modules like node-glob when necessary, resulting in much faster code execution and initialization time, and a bet")
+* [path-regex](https://www.npmjs.com/package/path-regex): Regular expression for matching the parts of a file path. | [homepage](https://github.com/regexps/path-regex "Regular expression for matching the parts of a file path.")
+* [to-regex-range](https://www.npmjs.com/package/to-regex-range): Pass two numbers, get a regex-compatible source string for matching ranges. Validated against more than… [more](https://github.com/micromatch/to-regex-range) | [homepage](https://github.com/micromatch/to-regex-range "Pass two numbers, get a regex-compatible source string for matching ranges. Validated against more than 2.78 million test assertions.")
+
+### Author
+
+**Jon Schlinkert**
+
+* [linkedin/in/jonschlinkert](https://linkedin.com/in/jonschlinkert)
+* [github/jonschlinkert](https://github.com/jonschlinkert)
+* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
+
+### License
+
+Copyright © 2018, [Jon Schlinkert](https://github.com/jonschlinkert).
+Released under the [MIT License](LICENSE).
+
+***
+
+_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on February 24, 2018._
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