202 lines
5.1 KiB
Markdown
202 lines
5.1 KiB
Markdown
<!--
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@license Apache-2.0
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Copyright (c) 2018 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# RegExp
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[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->
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> Create a [regular expression][regexp] from a [regular expression][regexp] string.
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<section class="installation">
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## Installation
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```bash
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npm install @stdlib/utils-regexp-from-string
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```
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</section>
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<section class="usage">
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## Usage
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```javascript
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var reFromString = require( '@stdlib/utils-regexp-from-string' );
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```
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#### reFromString( str )
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Parses a [regular expression][regexp] `string` and returns a new [regular expression][regexp].
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```javascript
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var re = reFromString( '/beep/' );
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// returns /beep/
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```
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</section>
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<!-- /.usage -->
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<section class="notes">
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## Notes
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- Provided `strings` **must** be properly **escaped**.
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<!-- eslint-disable no-useless-escape -->
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```javascript
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// Unescaped:
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var re = reFromString( '/\w+/' );
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// returns /w+/
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// Escaped:
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re = reFromString( '/\\w+/' );
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// returns /\w+/
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```
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</section>
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<!-- /.notes -->
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<section class="examples">
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## Examples
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<!-- eslint-disable no-useless-escape -->
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<!-- eslint no-undef: "error" -->
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```javascript
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var reFromString = require( '@stdlib/utils-regexp-from-string' );
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var re = reFromString( '/beep/' );
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// returns /beep/
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re = reFromString( '/[A-Z]*/' );
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// returns /[A-Z]*/
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re = reFromString( '/\\\\\\\//ig' );
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// returns /\\\//gi
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re = reFromString( '/[A-Z]{0,}/' );
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// returns /[A-Z]{0,}/
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re = reFromString( '/^boop$/' );
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// returns /^boop$/
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re = reFromString( '/(?:.*)/' );
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// returns /(?:.*)/
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re = reFromString( '/(?:beep|boop)/' );
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// returns /(?:beep|boop)/
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re = reFromString( '/\\w+/' );
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// returns /\w+/
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```
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</section>
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<!-- /.examples -->
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<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
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<section class="related">
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</section>
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<!-- /.related -->
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<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="main-repo" >
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* * *
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## Notice
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This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
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For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].
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#### Community
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[![Chat][chat-image]][chat-url]
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---
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## License
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See [LICENSE][stdlib-license].
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## Copyright
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Copyright © 2016-2022. The Stdlib [Authors][stdlib-authors].
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</section>
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<!-- /.stdlib -->
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<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="links">
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[npm-image]: http://img.shields.io/npm/v/@stdlib/utils-regexp-from-string.svg
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[npm-url]: https://npmjs.org/package/@stdlib/utils-regexp-from-string
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[test-image]: https://github.com/stdlib-js/utils-regexp-from-string/actions/workflows/test.yml/badge.svg?branch=v0.0.9
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[test-url]: https://github.com/stdlib-js/utils-regexp-from-string/actions/workflows/test.yml?query=branch:v0.0.9
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[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/utils-regexp-from-string/main.svg
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[coverage-url]: https://codecov.io/github/stdlib-js/utils-regexp-from-string?branch=main
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<!--
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[dependencies-image]: https://img.shields.io/david/stdlib-js/utils-regexp-from-string.svg
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[dependencies-url]: https://david-dm.org/stdlib-js/utils-regexp-from-string/main
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-->
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[chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg
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[chat-url]: https://gitter.im/stdlib-js/stdlib/
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[stdlib]: https://github.com/stdlib-js/stdlib
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[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors
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[umd]: https://github.com/umdjs/umd
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[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
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[deno-url]: https://github.com/stdlib-js/utils-regexp-from-string/tree/deno
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[umd-url]: https://github.com/stdlib-js/utils-regexp-from-string/tree/umd
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[esm-url]: https://github.com/stdlib-js/utils-regexp-from-string/tree/esm
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[branches-url]: https://github.com/stdlib-js/utils-regexp-from-string/blob/main/branches.md
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[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/utils-regexp-from-string/main/LICENSE
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[regexp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
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</section>
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<!-- /.links -->
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