Marc Mintel
5397309103
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95 lines
2.4 KiB
Plaintext
95 lines
2.4 KiB
Plaintext
# brace-expansion
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[Brace expansion](https://www.gnu.org/software/bash/manual/html_node/Brace-Expansion.html),
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as known from sh/bash, in JavaScript.
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[](https://github.com/juliangruber/brace-expansion/actions/workflows/ci.yml)
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[](https://www.npmjs.org/package/brace-expansion)
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## Example
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```js
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import { expand } from 'brace-expansion'
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expand('file-{a,b,c}.jpg')
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// => ['file-a.jpg', 'file-b.jpg', 'file-c.jpg']
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expand('-v{,,}')
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// => ['-v', '-v', '-v']
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expand('file{0..2}.jpg')
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// => ['file0.jpg', 'file1.jpg', 'file2.jpg']
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expand('file-{a..c}.jpg')
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// => ['file-a.jpg', 'file-b.jpg', 'file-c.jpg']
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expand('file{2..0}.jpg')
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// => ['file2.jpg', 'file1.jpg', 'file0.jpg']
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expand('file{0..4..2}.jpg')
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// => ['file0.jpg', 'file2.jpg', 'file4.jpg']
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expand('file-{a..e..2}.jpg')
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// => ['file-a.jpg', 'file-c.jpg', 'file-e.jpg']
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expand('file{00..10..5}.jpg')
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// => ['file00.jpg', 'file05.jpg', 'file10.jpg']
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expand('{{A..C},{a..c}}')
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// => ['A', 'B', 'C', 'a', 'b', 'c']
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expand('ppp{,config,oe{,conf}}')
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// => ['ppp', 'pppconfig', 'pppoe', 'pppoeconf']
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```
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## API
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```js
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import { expand } from '@isaacs/brace-expansion'
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```
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### const expanded = expand(str, [options])
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Return an array of all possible and valid expansions of `str`. If
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none are found, `[str]` is returned.
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The `options` object can provide a `max` value to cap the number
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of expansions allowed. This is limited to `100_000` by default,
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to prevent DoS attacks.
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```js
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const expansions = expand('{1..100}'.repeat(5), {
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max: 100,
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})
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// expansions.length will be 100, not 100^5
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```
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Valid expansions are:
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```js
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;/^(.*,)+(.+)?$/
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// {a,b,...}
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```
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A comma separated list of options, like `{a,b}` or `{a,{b,c}}` or `{,a,}`.
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```js
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;/^-?\d+\.\.-?\d+(\.\.-?\d+)?$/
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// {x..y[..incr]}
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```
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A numeric sequence from `x` to `y` inclusive, with optional increment.
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If `x` or `y` start with a leading `0`, all the numbers will be padded
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to have equal length. Negative numbers and backwards iteration work too.
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```js
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;/^-?\d+\.\.-?\d+(\.\.-?\d+)?$/
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// {x..y[..incr]}
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```
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An alphabetic sequence from `x` to `y` inclusive, with optional increment.
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`x` and `y` must be exactly one character, and if given, `incr` must be a
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number.
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For compatibility reasons, the string `${` is not eligible for brace expansion.
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