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205 lines
6.5 KiB
Markdown
205 lines
6.5 KiB
Markdown
# to-regex [](https://www.npmjs.com/package/to-regex) [](https://npmjs.org/package/to-regex) [](https://npmjs.org/package/to-regex) [](https://travis-ci.org/jonschlinkert/to-regex)
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> Generate a regex from a string or array of strings.
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Please consider following this project's author, [Jon Schlinkert](https://github.com/jonschlinkert), and consider starring the project to show your :heart: and support.
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- [Install](#install)
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- [Usage](#usage)
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- [Options](#options)
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* [options.contains](#optionscontains)
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* [options.negate](#optionsnegate)
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* [options.nocase](#optionsnocase)
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* [options.flags](#optionsflags)
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* [options.cache](#optionscache)
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* [options.safe](#optionssafe)
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- [About](#about)
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* [Related projects](#related-projects)
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* [Author](#author)
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* [License](#license)
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_(TOC generated by [verb](https://github.com/verbose/verb) using [markdown-toc](https://github.com/jonschlinkert/markdown-toc))_
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## Install
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Install with [npm](https://www.npmjs.com/):
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```sh
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$ npm install --save to-regex
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```
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## Usage
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```js
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var toRegex = require('to-regex');
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console.log(toRegex('foo'));
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//=> /^(?:foo)$/
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console.log(toRegex('foo', {negate: true}));
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//=> /^(?:(?:(?!^(?:foo)$).)*)$/
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console.log(toRegex('foo', {contains: true}));
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//=> /(?:foo)/
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console.log(toRegex(['foo', 'bar'], {negate: true}));
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//=> /^(?:(?:(?!^(?:(?:foo)|(?:bar))$).)*)$/
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console.log(toRegex(['foo', 'bar'], {negate: true, contains: true}));
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//=> /^(?:(?:(?!(?:(?:foo)|(?:bar))).)*)$/
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```
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## Options
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### options.contains
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**Type**: `Boolean`
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**Default**: `undefined`
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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.
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```js
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var toRegex = require('to-regex');
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console.log(toRegex('foo', {contains: true}));
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//=> /(?:foo)/
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```
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### options.negate
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**Type**: `Boolean`
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**Default**: `undefined`
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Create a regex that will match everything except the given pattern.
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```js
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var toRegex = require('to-regex');
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console.log(toRegex('foo', {negate: true}));
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//=> /^(?:(?:(?!^(?:foo)$).)*)$/
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```
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### options.nocase
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**Type**: `Boolean`
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**Default**: `undefined`
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Adds the `i` flag, to enable case-insensitive matching.
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```js
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var toRegex = require('to-regex');
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console.log(toRegex('foo', {nocase: true}));
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//=> /^(?:foo)$/i
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```
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Alternatively you can pass the flags you want directly on [options.flags](#options.flags).
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### options.flags
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**Type**: `String`
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**Default**: `undefined`
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Define the flags you want to use on the generated regex.
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```js
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var toRegex = require('to-regex');
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console.log(toRegex('foo', {flags: 'gm'}));
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//=> /^(?:foo)$/gm
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console.log(toRegex('foo', {flags: 'gmi', nocase: true})); //<= handles redundancy
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//=> /^(?:foo)$/gmi
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```
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### options.cache
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**Type**: `Boolean`
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**Default**: `true`
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Generated regex is cached based on the provided string and options. As a result, runtime compilation only happens once per pattern (as long as options are also the same), which can result in dramatic speed improvements.
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This also helps with debugging, since adding options and pattern are added to the generated regex.
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**Disable caching**
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```js
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toRegex('foo', {cache: false});
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```
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### options.safe
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**Type**: `Boolean`
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**Default**: `undefined`
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Check the generated regular expression with [safe-regex](https://github.com/substack/safe-regex) and throw an error if the regex is potentially unsafe.
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**Examples**
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```js
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console.log(toRegex('(x+x+)+y'));
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//=> /^(?:(x+x+)+y)$/
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// The following would throw an error
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toRegex('(x+x+)+y', {safe: true});
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```
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## About
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<details>
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<summary><strong>Contributing</strong></summary>
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Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
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</details>
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<details>
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<summary><strong>Running Tests</strong></summary>
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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:
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```sh
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$ npm install && npm test
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```
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</details>
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<details>
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<summary><strong>Building docs</strong></summary>
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_(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.)_
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To generate the readme, run the following command:
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```sh
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$ npm install -g verbose/verb#dev verb-generate-readme && verb
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```
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</details>
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### Related projects
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You might also be interested in these projects:
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* [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.")
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* [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")
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* [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.")
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* [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.")
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### Author
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**Jon Schlinkert**
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* [linkedin/in/jonschlinkert](https://linkedin.com/in/jonschlinkert)
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* [github/jonschlinkert](https://github.com/jonschlinkert)
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* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
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### License
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Copyright © 2018, [Jon Schlinkert](https://github.com/jonschlinkert).
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Released under the [MIT License](LICENSE).
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***
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_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on February 24, 2018._ |