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1# ansi-regex [![Build Status](https://travis-ci.org/chalk/ansi-regex.svg?branch=master)](https://travis-ci.org/chalk/ansi-regex)
2
3> Regular expression for matching [ANSI escape codes](https://en.wikipedia.org/wiki/ANSI_escape_code)
4
5
6## Install
7
8```
9$ npm install ansi-regex
10```
11
12
13## Usage
14
15```js
16const ansiRegex = require('ansi-regex');
17
18ansiRegex().test('\u001B[4mcake\u001B[0m');
19//=> true
20
21ansiRegex().test('cake');
22//=> false
23
24'\u001B[4mcake\u001B[0m'.match(ansiRegex());
25//=> ['\u001B[4m', '\u001B[0m']
26
27'\u001B[4mcake\u001B[0m'.match(ansiRegex({onlyFirst: true}));
28//=> ['\u001B[4m']
29```
30
31
32## API
33
34### ansiRegex([options])
35
36Returns a regex for matching ANSI escape codes.
37
38#### options
39
40##### onlyFirst
41
42Type: `boolean`<br>
43Default: `false` *(Matches any ANSI escape codes in a string)*
44
45Match only the first ANSI escape.
46
47
48## FAQ
49
50### Why do you test for codes not in the ECMA 48 standard?
51
52Some of the codes we run as a test are codes that we acquired finding various lists of non-standard or manufacturer specific codes. We test for both standard and non-standard codes, as most of them follow the same or similar format and can be safely matched in strings without the risk of removing actual string content. There are a few non-standard control codes that do not follow the traditional format (i.e. they end in numbers) thus forcing us to exclude them from the test because we cannot reliably match them.
53
54On the historical side, those ECMA standards were established in the early 90's whereas the VT100, for example, was designed in the mid/late 70's. At that point in time, control codes were still pretty ungoverned and engineers used them for a multitude of things, namely to activate hardware ports that may have been proprietary. Somewhere else you see a similar 'anarchy' of codes is in the x86 architecture for processors; there are a ton of "interrupts" that can mean different things on certain brands of processors, most of which have been phased out.
55
56
57## Maintainers
58
59- [Sindre Sorhus](https://github.com/sindresorhus)
60- [Josh Junon](https://github.com/qix-)
61
62
63## License
64
65MIT