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1# Regenerate [![Build status](https://travis-ci.org/mathiasbynens/regenerate.svg?branch=master)](https://travis-ci.org/mathiasbynens/regenerate) [![Code coverage status](https://img.shields.io/codecov/c/github/mathiasbynens/regenerate.svg)](https://codecov.io/gh/mathiasbynens/regenerate)
2
3_Regenerate_ is a Unicode-aware regex generator for JavaScript. It allows you to easily generate ES5-compatible regular expressions based on a given set of Unicode symbols or code points. (This is trickier than you might think, because of [how JavaScript deals with astral symbols](https://mathiasbynens.be/notes/javascript-unicode).)
4
5## Installation
6
7Via [npm](https://npmjs.org/):
8
9```bash
10npm install regenerate
11```
12
13Via [Bower](http://bower.io/):
14
15```bash
16bower install regenerate
17```
18
19In a browser:
20
21```html
22<script src="regenerate.js"></script>
23```
24
25In [Node.js](https://nodejs.org/), [io.js](https://iojs.org/), and [RingoJS ≥ v0.8.0](http://ringojs.org/):
26
27```js
28var regenerate = require('regenerate');
29```
30
31In [Narwhal](http://narwhaljs.org/) and [RingoJS ≤ v0.7.0](http://ringojs.org/):
32
33```js
34var regenerate = require('regenerate').regenerate;
35```
36
37In [Rhino](http://www.mozilla.org/rhino/):
38
39```js
40load('regenerate.js');
41```
42
43Using an AMD loader like [RequireJS](http://requirejs.org/):
44
45```js
46require(
47 {
48 'paths': {
49 'regenerate': 'path/to/regenerate'
50 }
51 },
52 ['regenerate'],
53 function(regenerate) {
54 console.log(regenerate);
55 }
56);
57```
58
59## API
60
61### `regenerate(value1, value2, value3, ...)`
62
63The main Regenerate function. Calling this function creates a new set that gets a chainable API.
64
65```js
66var set = regenerate()
67 .addRange(0x60, 0x69) // add U+0060 to U+0069
68 .remove(0x62, 0x64) // remove U+0062 and U+0064
69 .add(0x1D306); // add U+1D306
70set.valueOf();
71// → [0x60, 0x61, 0x63, 0x65, 0x66, 0x67, 0x68, 0x69, 0x1D306]
72set.toString();
73// → '[`ace-i]|\\uD834\\uDF06'
74set.toRegExp();
75// → /[`ace-i]|\uD834\uDF06/
76```
77
78Any arguments passed to `regenerate()` will be added to the set right away. Both code points (numbers) and symbols (strings consisting of a single Unicode symbol) are accepted, as well as arrays containing values of these types.
79
80```js
81regenerate(0x1D306, 'A', '©', 0x2603).toString();
82// → '[A\\xA9\\u2603]|\\uD834\\uDF06'
83
84var items = [0x1D306, 'A', '©', 0x2603];
85regenerate(items).toString();
86// → '[A\\xA9\\u2603]|\\uD834\\uDF06'
87```
88
89### `regenerate.prototype.add(value1, value2, value3, ...)`
90
91Any arguments passed to `add()` are added to the set. Both code points (numbers) and symbols (strings consisting of a single Unicode symbol) are accepted, as well as arrays containing values of these types.
92
93```js
94regenerate().add(0x1D306, 'A', '©', 0x2603).toString();
95// → '[A\\xA9\\u2603]|\\uD834\\uDF06'
96
97var items = [0x1D306, 'A', '©', 0x2603];
98regenerate().add(items).toString();
99// → '[A\\xA9\\u2603]|\\uD834\\uDF06'
100```
101
102It’s also possible to pass in a Regenerate instance. Doing so adds all code points in that instance to the current set.
103
104```js
105var set = regenerate(0x1D306, 'A');
106regenerate().add('©', 0x2603).add(set).toString();
107// → '[A\\xA9\\u2603]|\\uD834\\uDF06'
108```
109
110Note that the initial call to `regenerate()` acts like `add()`. This allows you to create a new Regenerate instance and add some code points to it in one go:
111
112```js
113regenerate(0x1D306, 'A', '©', 0x2603).toString();
114// → '[A\\xA9\\u2603]|\\uD834\\uDF06'
115```
116
117### `regenerate.prototype.remove(value1, value2, value3, ...)`
118
119Any arguments passed to `remove()` are removed from the set. Both code points (numbers) and symbols (strings consisting of a single Unicode symbol) are accepted, as well as arrays containing values of these types.
120
121```js
122regenerate(0x1D306, 'A', '©', 0x2603).remove('☃').toString();
123// → '[A\\xA9]|\\uD834\\uDF06'
124```
125
126It’s also possible to pass in a Regenerate instance. Doing so removes all code points in that instance from the current set.
127
128```js
129var set = regenerate('☃');
130regenerate(0x1D306, 'A', '©', 0x2603).remove(set).toString();
131// → '[A\\xA9]|\\uD834\\uDF06'
132```
133
134### `regenerate.prototype.addRange(start, end)`
135
136Adds a range of code points from `start` to `end` (inclusive) to the set. Both code points (numbers) and symbols (strings consisting of a single Unicode symbol) are accepted.
137
138```js
139regenerate(0x1D306).addRange(0x00, 0xFF).toString(16);
140// → '[\\0-\\xFF]|\\uD834\\uDF06'
141
142regenerate().addRange('A', 'z').toString();
143// → '[A-z]'
144```
145
146### `regenerate.prototype.removeRange(start, end)`
147
148Removes a range of code points from `start` to `end` (inclusive) from the set. Both code points (numbers) and symbols (strings consisting of a single Unicode symbol) are accepted.
149
150```js
151regenerate()
152 .addRange(0x000000, 0x10FFFF) // add all Unicode code points
153 .removeRange('A', 'z') // remove all symbols from `A` to `z`
154 .toString();
155// → '[\\0-@\\{-\\uD7FF\\uE000-\\uFFFF]|[\\uD800-\\uDBFF][\\uDC00-\\uDFFF]|[\\uD800-\\uDBFF](?![\\uDC00-\\uDFFF])|(?:[^\\uD800-\\uDBFF]|^)[\\uDC00-\\uDFFF]'
156
157regenerate()
158 .addRange(0x000000, 0x10FFFF) // add all Unicode code points
159 .removeRange(0x0041, 0x007A) // remove all code points from U+0041 to U+007A
160 .toString();
161// → '[\\0-@\\{-\\uD7FF\\uE000-\\uFFFF]|[\\uD800-\\uDBFF][\\uDC00-\\uDFFF]|[\\uD800-\\uDBFF](?![\\uDC00-\\uDFFF])|(?:[^\\uD800-\\uDBFF]|^)[\\uDC00-\\uDFFF]'
162```
163
164### `regenerate.prototype.intersection(codePoints)`
165
166Removes any code points from the set that are not present in both the set and the given `codePoints` array. `codePoints` must be an array of numeric code point values, i.e. numbers.
167
168```js
169regenerate()
170 .addRange(0x00, 0xFF) // add extended ASCII code points
171 .intersection([0x61, 0x69]) // remove all code points from the set except for these
172 .toString();
173// → '[ai]'
174```
175
176Instead of the `codePoints` array, it’s also possible to pass in a Regenerate instance.
177
178```js
179var whitelist = regenerate(0x61, 0x69);
180
181regenerate()
182 .addRange(0x00, 0xFF) // add extended ASCII code points
183 .intersection(whitelist) // remove all code points from the set except for those in the `whitelist` set
184 .toString();
185// → '[ai]'
186```
187
188### `regenerate.prototype.contains(value)`
189
190Returns `true` if the given value is part of the set, and `false` otherwise. Both code points (numbers) and symbols (strings consisting of a single Unicode symbol) are accepted.
191
192```js
193var set = regenerate().addRange(0x00, 0xFF);
194set.contains('A');
195// → true
196set.contains(0x1D306);
197// → false
198```
199
200### `regenerate.prototype.clone()`
201
202Returns a clone of the current code point set. Any actions performed on the clone won’t mutate the original set.
203
204```js
205var setA = regenerate(0x1D306);
206var setB = setA.clone().add(0x1F4A9);
207setA.toArray();
208// → [0x1D306]
209setB.toArray();
210// → [0x1D306, 0x1F4A9]
211```
212
213### `regenerate.prototype.toString(options)`
214
215Returns a string representing (part of) a regular expression that matches all the symbols mapped to the code points within the set.
216
217```js
218regenerate(0x1D306, 0x1F4A9).toString();
219// → '\\uD834\\uDF06|\\uD83D\\uDCA9'
220```
221
222If the `bmpOnly` property of the optional `options` object is set to `true`, the output matches surrogates individually, regardless of whether they’re lone surrogates or just part of a surrogate pair. This simplifies the output, but it can only be used in case you’re certain the strings it will be used on don’t contain any astral symbols.
223
224```js
225var highSurrogates = regenerate().addRange(0xD800, 0xDBFF);
226highSurrogates.toString();
227// → '[\\uD800-\\uDBFF](?![\\uDC00-\\uDFFF])'
228highSurrogates.toString({ 'bmpOnly': true });
229// → '[\\uD800-\\uDBFF]'
230
231var lowSurrogates = regenerate().addRange(0xDC00, 0xDFFF);
232lowSurrogates.toString();
233// → '(?:[^\\uD800-\\uDBFF]|^)[\\uDC00-\\uDFFF]'
234lowSurrogates.toString({ 'bmpOnly': true });
235// → '[\\uDC00-\\uDFFF]'
236```
237
238Note that lone low surrogates cannot be matched accurately using regular expressions in JavaScript without the use of [lookbehind assertions](https://mathiasbynens.be/notes/es-regexp-proposals#lookbehinds), which aren't yet widely supported. Regenerate’s output makes a best-effort approach but [there can be false negatives in this regard](https://github.com/mathiasbynens/regenerate/issues/28#issuecomment-72224808).
239
240If the `hasUnicodeFlag` property of the optional `options` object is set to `true`, the output makes use of Unicode code point escapes (`\u{…}`) where applicable. This simplifies the output at the cost of compatibility and portability, since it means the output can only be used as a pattern in a regular expression with [the ES6 `u` flag](https://mathiasbynens.be/notes/es6-unicode-regex) enabled.
241
242```js
243var set = regenerate().addRange(0x0, 0x10FFFF);
244
245set.toString();
246// → '[\\0-\\uD7FF\\uE000-\\uFFFF]|[\\uD800-\\uDBFF][\\uDC00-\\uDFFF]|[\\uD800-\\uDBFF](?![\\uDC00-\\uDFFF])|(?:[^\\uD800-\\uDBFF]|^)[\\uDC00-\\uDFFF]''
247
248set.toString({ 'hasUnicodeFlag': true });
249// → '[\\0-\\u{10FFFF}]'
250```
251
252### `regenerate.prototype.toRegExp(flags = '')`
253
254Returns a regular expression that matches all the symbols mapped to the code points within the set. Optionally, you can pass [flags](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Parameters) to be added to the regular expression.
255
256```js
257var regex = regenerate(0x1D306, 0x1F4A9).toRegExp();
258// → /\uD834\uDF06|\uD83D\uDCA9/
259regex.test('𝌆');
260// → true
261regex.test('A');
262// → false
263
264// With flags:
265var regex = regenerate(0x1D306, 0x1F4A9).toRegExp('g');
266// → /\uD834\uDF06|\uD83D\uDCA9/g
267```
268
269**Note:** This probably shouldn’t be used. Regenerate is intended as a tool that is used as part of a build process, not at runtime.
270
271### `regenerate.prototype.valueOf()` or `regenerate.prototype.toArray()`
272
273Returns a sorted array of unique code points in the set.
274
275```js
276regenerate(0x1D306)
277 .addRange(0x60, 0x65)
278 .add(0x59, 0x60) // note: 0x59 is added after 0x65, and 0x60 is a duplicate
279 .valueOf();
280// → [0x59, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x1D306]
281```
282
283### `regenerate.version`
284
285A string representing the semantic version number.
286
287## Combine Regenerate with other libraries
288
289Regenerate gets even better when combined with other libraries such as [Punycode.js](https://mths.be/punycode). Here’s an example where [Punycode.js](https://mths.be/punycode) is used to convert a string into an array of code points, that is then passed on to Regenerate:
290
291```js
292var regenerate = require('regenerate');
293var punycode = require('punycode');
294
295var string = 'Lorem ipsum dolor sit amet.';
296// Get an array of all code points used in the string:
297var codePoints = punycode.ucs2.decode(string);
298
299// Generate a regular expression that matches any of the symbols used in the string:
300regenerate(codePoints).toString();
301// → '[ \\.Ladeilmopr-u]'
302```
303
304In ES6 you can do something similar with [`Array.from`](https://mths.be/array-from) which uses [the string’s iterator](https://mathiasbynens.be/notes/javascript-unicode#iterating-over-symbols) to split the given string into an array of strings that each contain a single symbol. [`regenerate()`](#regenerateprototypeaddvalue1-value2-value3-) accepts both strings and code points, remember?
305
306```js
307var regenerate = require('regenerate');
308
309var string = 'Lorem ipsum dolor sit amet.';
310// Get an array of all symbols used in the string:
311var symbols = Array.from(string);
312
313// Generate a regular expression that matches any of the symbols used in the string:
314regenerate(symbols).toString();
315// → '[ \\.Ladeilmopr-u]'
316```
317
318## Support
319
320Regenerate supports at least Chrome 27+, Firefox 3+, Safari 4+, Opera 10+, IE 6+, Node.js v0.10.0+, io.js v1.0.0+, Narwhal 0.3.2+, RingoJS 0.8+, PhantomJS 1.9.0+, and Rhino 1.7RC4+.
321
322## Unit tests & code coverage
323
324After cloning this repository, run `npm install` to install the dependencies needed for Regenerate development and testing. You may want to install Istanbul _globally_ using `npm install istanbul -g`.
325
326Once that’s done, you can run the unit tests in Node using `npm test` or `node tests/tests.js`. To run the tests in Rhino, Ringo, Narwhal, and web browsers as well, use `grunt test`.
327
328To generate the code coverage report, use `grunt cover`.
329
330## Author
331
332| [![twitter/mathias](https://gravatar.com/avatar/24e08a9ea84deb17ae121074d0f17125?s=70)](https://twitter.com/mathias "Follow @mathias on Twitter") |
333|---|
334| [Mathias Bynens](https://mathiasbynens.be/) |
335
336## License
337
338Regenerate is available under the [MIT](https://mths.be/mit) license.
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