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# split-string [![NPM version](https://img.shields.io/npm/v/split-string.svg?style=flat)](https://www.npmjs.com/package/split-string) [![NPM monthly downloads](https://img.shields.io/npm/dm/split-string.svg?style=flat)](https://npmjs.org/package/split-string) [![NPM total downloads](https://img.shields.io/npm/dt/split-string.svg?style=flat)](https://npmjs.org/package/split-string) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/split-string.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/split-string)
> Split a string on a character except when the character is escaped.
<!-- section: Why use this? -->
<details>
<summary><strong>Why use this?</strong></summary>
<br>
Although it's easy to split on a string:
```js
console.log('a.b.c'.split('.'));
//=> ['a', 'b', 'c']
```
It's more challenging to split a string whilst respecting escaped or quoted characters.
**Bad**
```js
console.log('a\\.b.c'.split('.'));
//=> ['a\\', 'b', 'c']
console.log('"a.b.c".d'.split('.'));
//=> ['"a', 'b', 'c"', 'd']
```
**Good**
```js
var split = require('split-string');
console.log(split('a\\.b.c'));
//=> ['a.b', 'c']
console.log(split('"a.b.c".d'));
//=> ['a.b.c', 'd']
```
See the [options](#options) to learn how to choose the separator or retain quotes or escaping.
<br>
</details>
## Install
Install with [npm](https://www.npmjs.com/):
```sh
$ npm install --save split-string
```
Install with [yarn](https://yarnpkg.com):
```sh
$ yarn add split-string
```
## Usage
```js
var split = require('split-string');
split('a.b.c');
//=> ['a', 'b', 'c']
// respects escaped characters
split('a.b.c\\.d');
//=> ['a', 'b', 'c.d']
// respects double-quoted strings
split('a."b.c.d".e');
//=> ['a', 'b.c.d', 'e']
```
## Options
### options.sep
**Type**: `String`
**Default**: `.`
The separator/character to split on.
**Example**
```js
split('a.b,c', {sep: ','});
//=> ['a.b', 'c']
// you can also pass the separator as string as the last argument
split('a.b,c', ',');
//=> ['a.b', 'c']
```
### options.keepEscaping
**Type**: `Boolean`
**Default**: `undefined`
Keep backslashes in the result.
**Example**
```js
split('a.b\\.c');
//=> ['a', 'b.c']
split('a.b.\\c', {keepEscaping: true});
//=> ['a', 'b\.c']
```
### options.keepQuotes
**Type**: `Boolean`
**Default**: `undefined`
Keep single- or double-quotes in the result.
**Example**
```js
split('a."b.c.d".e');
//=> ['a', 'b.c.d', 'e']
split('a."b.c.d".e', {keepQuotes: true});
//=> ['a', '"b.c.d"', 'e']
split('a.\'b.c.d\'.e', {keepQuotes: true});
//=> ['a', '\'b.c.d\'', 'e']
```
### options.keepDoubleQuotes
**Type**: `Boolean`
**Default**: `undefined`
Keep double-quotes in the result.
**Example**
```js
split('a."b.c.d".e');
//=> ['a', 'b.c.d', 'e']
split('a."b.c.d".e', {keepDoubleQuotes: true});
//=> ['a', '"b.c.d"', 'e']
```
### options.keepSingleQuotes
**Type**: `Boolean`
**Default**: `undefined`
Keep single-quotes in the result.
**Example**
```js
split('a.\'b.c.d\'.e');
//=> ['a', 'b.c.d', 'e']
split('a.\'b.c.d\'.e', {keepSingleQuotes: true});
//=> ['a', '\'b.c.d\'', 'e']
```
## Customizer
**Type**: `Function`
**Default**: `undefined`
Pass a function as the last argument to customize how tokens are added to the array.
**Example**
```js
var arr = split('a.b', function(tok) {
if (tok.arr[tok.arr.length - 1] === 'a') {
tok.split = false;
}
});
console.log(arr);
//=> ['a.b']
```
**Properties**
The `tok` object has the following properties:
* `tok.val` (string) The current value about to be pushed onto the result array
* `tok.idx` (number) the current index in the string
* `tok.str` (string) the entire string
* `tok.arr` (array) the result array
## About
### Related projects
* [deromanize](https://www.npmjs.com/package/deromanize): Convert roman numerals to arabic numbers (useful for books, outlines, documentation, slide decks, etc) | [homepage](https://github.com/jonschlinkert/deromanize "Convert roman numerals to arabic numbers (useful for books, outlines, documentation, slide decks, etc)")
* [randomatic](https://www.npmjs.com/package/randomatic): Generate randomized strings of a specified length, fast. Only the length is necessary, but you… [more](https://github.com/jonschlinkert/randomatic) | [homepage](https://github.com/jonschlinkert/randomatic "Generate randomized strings of a specified length, fast. Only the length is necessary, but you can optionally generate patterns using any combination of numeric, alpha-numeric, alphabetical, special or custom characters.")
* [repeat-string](https://www.npmjs.com/package/repeat-string): Repeat the given string n times. Fastest implementation for repeating a string. | [homepage](https://github.com/jonschlinkert/repeat-string "Repeat the given string n times. Fastest implementation for repeating a string.")
* [romanize](https://www.npmjs.com/package/romanize): Convert arabic numbers to roman numerals (useful for books, outlines, documentation, slide decks, etc) | [homepage](https://github.com/jonschlinkert/romanize "Convert arabic numbers to roman numerals (useful for books, outlines, documentation, slide decks, etc)")
### Contributing
Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
### Contributors
| **Commits** | **Contributor** |
| --- | --- |
| 12 | [jonschlinkert](https://github.com/jonschlinkert) |
| 9 | [doowb](https://github.com/doowb) |
### Building docs
_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_
To generate the readme, run the following command:
```sh
$ npm install -g verbose/verb#dev verb-generate-readme && verb
```
### Running tests
Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
```sh
$ npm install && npm test
```
### Author
**Jon Schlinkert**
* [github/jonschlinkert](https://github.com/jonschlinkert)
* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
### License
Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
Released under the [MIT License](LICENSE).
***
_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on April 27, 2017._
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