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split-string NPM version NPM monthly downloads NPM total downloads Linux Build Status

Easy way to split a string on a given character unless it's quoted or escaped.

Please consider following this project's author, Jon Schlinkert, and consider starring the project to show your ❤️ and support.


Install with npm:

$ npm install --save split-string


const split = require('split-string');

//=> ['a', 'b', 'c']

// respects escaped characters
//=> ['a', 'b', 'c.d']

// respects double-quoted strings
//=> ['a', '"b.c.d"', 'e']



Type: Array|Boolean

Default: []


Tell split-string not to split inside any of the quote characters specified on the quotes option. Each character signifies both the "opening" and "closing" character to use.

// default behavior
//=> [ 'a', 'b', '"c', 'd', 'e', 'f', 'g"', 'h', 'i' ]

// with quotes
console.log(split('a.b."c.d.e.f.g".h.i', { quotes: ['"'] }));
//=> [ 'a', 'b', '"c.d.e.f.g"', 'h', 'i' ]

// escaped quotes will be ignored
console.log(split('a.b.\\"c.d."e.f.g".h.i', { quotes: ['"'] }));
//=> [ 'a', 'b', '"c', 'd', '"e.f.g"', 'h', 'i' ]

// example of how to exclude non-escaped quotes from the result
let keep = (value, state) => {
  return value !== '\\' && (value !== '"' || state.prev() === '\\');
console.log(split('a.b.\\"c.d."e.f.g".h.i', { quotes: ['"'], keep }));
//=> [ 'a', 'b', '"c', 'd', 'e.f.g', 'h', 'i' ]



Type: Object|Boolean

Default: {}


By default, no special significance is given to bracket-like characters (such as square brackets, curly braces, angle brackets, and so on).

// default behavior
//=> [ 'a', '{b', 'c}', '{d', 'e}' ]

When options.brackets is true, the following brackets types are supported:

  '<': '>',
  '(': ')',
  '[': ']',
  '{': '}'

For example:

console.log(split('a.{b.c}.{d.e}', { brackets: true }));
//=> [ 'a', '{b.c}', '{d.e}' ]

Alternatively, an object of brackets may be passed, where each key is the opening bracket and each value is the corresponding closing bracket. Note that the key and value must be different characters. If you want to use the same character for both open and close, use the quotes option.


// no bracket support by default
//=> [ 'a', '{b', 'c}', '[d', 'e]', 'f' ]

// tell split-string not to split inside curly braces
console.log(split('a.{b.c}.[d.e].f', { brackets: { '{': '}' }}));
//=> [ 'a', '{b.c}', '[d', 'e]', 'f' ]

// tell split-string not to split inside any of these types: "<>{}[]()"
console.log(split('a.{b.c}.[d.e].f', { brackets: true }));
//=> [ 'a', '{b.c}', '[d.e]', 'f' ]

// ...nested brackets are also supported
console.log(split('a.{b.{c.d}.e}.f', { brackets: true }));
//=> [ 'a', '{b.{c.d}.e}', 'f' ]

// tell split-string not to split inside the given custom types
console.log(split('«a.b».⟨c.d⟩.[e.f]', { brackets: { '«': '»', '⟨': '⟩' } }));
//=> [ '«a.b»', '⟨c.d⟩', '[e', 'f]' ]


Type: function

Default: Function that returns true if the character is not \\.

Function that returns true when a character should be retained in the result.


console.log(split('a.b\\.c')); //=> ['a', 'b.c']

// keep all characters
console.log(split('a.b.\\c', { keep: () => true })); //=> ['a', 'b\.c']


Type: string

Default: .

The character to split on.


console.log(split('a.b,c', { separator: ',' })); //=> ['a.b', 'c']

Split function

Optionally pass a function as the last argument to tell split-string whether or not to split when the specified separator is encountered.


// only split on "." when the "previous" character is "a"
console.log(split('a.b.c.a.d.e', state => state.prev() === 'a'));
//=> [ 'a', 'b.c.a', 'd.e' ]

The state object exposes the following properties:

  • input - (String) The un-modified, user-defined input string
  • separator - (String) the specified separator to split on.
  • index - (Number) The current cursor position
  • value - (String) The character at the current index
  • bos - (Function) Returns true if position is at the beginning-of-string
  • eos - (Function) Returns true if position is at the end-of-string
  • prev - (Function) Returns the previously scanned character
  • next - (Function) Returns the next character after the current position
  • block - (Object) The "current" AST node.
  • stack - (Array) AST nodes



Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

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:

$ npm install && npm test
Building docs

(This project's is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the readme template.)

To generate the readme, run the following command:

$ npm install -g verbose/verb#dev verb-generate-readme && verb

Related projects

You might also be interested in these projects:

  • deromanize: Convert roman numerals to arabic numbers (useful for books, outlines, documentation, slide decks, etc) | homepage
  • randomatic: Generate randomized strings of a specified length using simple character sequences. The original generate-password. | homepage
  • repeat-string: Repeat the given string n times. Fastest implementation for repeating a string. | homepage
  • romanize: Convert numbers to roman numerals (useful for books, outlines, documentation, slide decks, etc) | homepage


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Jon Schlinkert


Copyright © 2019, Jon Schlinkert. Released under the MIT License.

This file was generated by verb-generate-readme, v0.8.0, on April 22, 2019.