136 lines
3.1 KiB
Markdown
136 lines
3.1 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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# Filename Extension
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> [Regular expression][regexp] to capture a filename extension.
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<section class="usage">
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## Usage
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```javascript
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var reExtname = require( '@stdlib/regexp/extname' );
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```
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#### reExtname( \[platform] )
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Returns a [regular expression][regexp] to capture a filename extension.
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```javascript
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var RE = reExtname();
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// returns <RegExp>
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RE = reExtname( 'posix' );
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// returns <RegExp>
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var ext = RE.exec( '/foo/bar/index.js' )[ 1 ];
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// returns '.js'
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RE = reExtname( 'win32' );
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// returns <RegExp>
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ext = RE.exec( 'C:\\foo\\bar\\index.js' )[ 1 ];
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// returns '.js'
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```
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#### reExtname.REGEXP
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[Regular expression][regexp] to capture a filename extension.
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```javascript
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var bool = ( reExtname.REGEXP.toString() === reExtname().toString() );
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// returns true
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```
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#### reExtname.REGEXP_POSIX
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[Regular expression][@stdlib/regexp/extname-posix] to capture a [POSIX][posix] filename extension.
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```javascript
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var ext = reExtname.REGEXP_POSIX.exec( '/foo/bar/index.js' )[ 1 ];
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// returns '.js'
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```
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#### reExtname.REGEXP_WIN32
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[Regular expression][@stdlib/regexp/extname-windows] to capture a Windows filename extension.
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```javascript
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var ext = reExtname.REGEXP_WIN32.exec( 'C:\\foo\\bar\\index.js' )[ 1 ];
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// returns '.js'
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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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- The as `REGEXP` exported [regular expression][regexp] is [platform][@stdlib/assert/is-windows]-dependent. If the current process is running on Windows, `REGEXP === REGEXP_WIN32`; otherwise, `REGEXP === REGEXP_POSIX`.
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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 no-undef: "error" -->
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```javascript
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var reExtname = require( '@stdlib/regexp/extname' );
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var RE_EXTNAME = reExtname();
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var ext;
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// Assuming a POSIX platform...
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ext = RE_EXTNAME.exec( '/foo/bar/index.js' )[ 1 ];
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// returns '.js'
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ext = reExtname.REGEXP_WIN32.exec( '/foo/bar/home.html' )[ 1 ];
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// returns '.html'
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ext = reExtname.REGEXP_WIN32.exec( 'C:\\foo\\bar\\home.html' )[ 1 ];
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// returns '.html'
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```
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</section>
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<!-- /.examples -->
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<section class="links">
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[regexp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
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[posix]: https://en.wikipedia.org/wiki/POSIX
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[@stdlib/assert/is-windows]: https://www.npmjs.com/package/@stdlib/assert-is-windows
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[@stdlib/regexp/extname-posix]: https://www.npmjs.com/package/@stdlib/regexp/tree/main/extname-posix
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[@stdlib/regexp/extname-windows]: https://www.npmjs.com/package/@stdlib/regexp/tree/main/extname-windows
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</section>
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<!-- /.links -->
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