> Convert extended globs to regex-compatible strings. Add (almost) the expressive power of regular expressions to glob patterns.
Install with [npm](https://www.npmjs.com/)
```sh
$ npm i extglob --save
```
Used by [micromatch](https://github.com/jonschlinkert/micromatch).
**Features**
* Convert an extglob string to a regex-compatible string. **Only converts extglobs**, to handle full globs use [micromatch](https://github.com/jonschlinkert/micromatch).
* Pass `{regex: true}` to return a regex
* Handles nested patterns
* More complete (and correct) support than [minimatch](https://github.com/isaacs/minimatch)
## Usage
```js
var extglob = require('extglob');
extglob('?(z)');
//=> '(?:z)?'
extglob('*(z)');
//=> '(?:z)*'
extglob('+(z)');
//=> '(?:z)+'
extglob('@(z)');
//=> '(?:z)'
extglob('!(z)');
//=> '(?!^(?:(?!z)[^/]*?)).*$'
```
**Optionally return regex**
```js
extglob('!(z)', {regex: true});
//=> /(?!^(?:(?!z)[^/]*?)).*$/
```
## Extglob patterns
To learn more about how extglobs work, see the docs for [Bash pattern matching](https://www.gnu.org/software/bash/manual/html_node/Pattern-Matching.html):
*`?(pattern)`: Match zero or one occurrence of the given pattern.
*`*(pattern)`: Match zero or more occurrences of the given pattern.
*`+(pattern)`: Match one or more occurrences of the given pattern.
*`@(pattern)`: Match one of the given pattern.
*`!(pattern)`: Match anything except one of the given pattern.
## Related
* [braces](https://github.com/jonschlinkert/braces): Fastest brace expansion for node.js, with the most complete support for the Bash 4.3 braces… [more](https://github.com/jonschlinkert/braces)
* [expand-range](https://github.com/jonschlinkert/expand-range): Fast, bash-like range expansion. Expand a range of numbers or letters, uppercase or lowercase. See… [more](https://github.com/jonschlinkert/expand-range)
* [fill-range](https://github.com/jonschlinkert/fill-range): Fill in a range of numbers or letters, optionally passing an increment or multiplier to… [more](https://github.com/jonschlinkert/fill-range)
* [micromatch](https://github.com/jonschlinkert/micromatch): Glob matching for javascript/node.js. A drop-in replacement and faster alternative to minimatch and multimatch. Just… [more](https://github.com/jonschlinkert/micromatch)
## Run tests
Install dev dependencies:
```sh
$ npm i -d && npm test
```
## Contributing
Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](https://github.com/jonschlinkert/extglob/issues/new)
