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The MIT License (MIT)
Copyright (c) 2015-2017, Jon Schlinkert
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# to-regex-range [![NPM version](https://img.shields.io/npm/v/to-regex-range.svg?style=flat)](https://www.npmjs.com/package/to-regex-range) [![NPM monthly downloads](https://img.shields.io/npm/dm/to-regex-range.svg?style=flat)](https://npmjs.org/package/to-regex-range) [![NPM total downloads](https://img.shields.io/npm/dt/to-regex-range.svg?style=flat)](https://npmjs.org/package/to-regex-range) [![Linux Build Status](https://img.shields.io/travis/micromatch/to-regex-range.svg?style=flat&label=Travis)](https://travis-ci.org/micromatch/to-regex-range)
> Pass two numbers, get a regex-compatible source string for matching ranges. Validated against more than 2.78 million test assertions.
## Install
Install with [npm](https://www.npmjs.com/):
```sh
$ npm install --save to-regex-range
```
Install with [yarn](https://yarnpkg.com):
```sh
$ yarn add to-regex-range
```
<details>
<summary><strong>What does this do?</strong></summary>
<br>
This libary generates the `source` string to be passed to `new RegExp()` for matching a range of numbers.
**Example**
```js
var toRegexRange = require('to-regex-range');
var regex = new RegExp(toRegexRange('15', '95'));
```
A string is returned so that you can do whatever you need with it before passing it to `new RegExp()` (like adding `^` or `$` boundaries, defining flags, or combining it another string).
<br>
</details>
<details>
<summary><strong>Why use this library?</strong></summary>
<br>
### Convenience
Creating regular expressions for matching numbers gets deceptively complicated pretty fast.
For example, let's say you need a validation regex for matching part of a user-id, postal code, social security number, tax id, etc:
* regex for matching `1` => `/1/` (easy enough)
* regex for matching `1` through `5` => `/[1-5]/` (not bad...)
* regex for matching `1` or `5` => `/(1|5)/` (still easy...)
* regex for matching `1` through `50` => `/([1-9]|[1-4][0-9]|50)/` (uh-oh...)
* regex for matching `1` through `55` => `/([1-9]|[1-4][0-9]|5[0-5])/` (no prob, I can do this...)
* regex for matching `1` through `555` => `/([1-9]|[1-9][0-9]|[1-4][0-9]{2}|5[0-4][0-9]|55[0-5])/` (maybe not...)
* regex for matching `0001` through `5555` => `/(0{3}[1-9]|0{2}[1-9][0-9]|0[1-9][0-9]{2}|[1-4][0-9]{3}|5[0-4][0-9]{2}|55[0-4][0-9]|555[0-5])/` (okay, I get the point!)
The numbers are contrived, but they're also really basic. In the real world you might need to generate a regex on-the-fly for validation.
**Learn more**
If you're interested in learning more about [character classes](http://www.regular-expressions.info/charclass.html) and other regex features, I personally have always found [regular-expressions.info](http://www.regular-expressions.info/charclass.html) to be pretty useful.
### Heavily tested
As of April 27, 2017, this library runs [2,783,483 test assertions](./test/test.js) against generated regex-ranges to provide brute-force verification that results are indeed correct.
Tests run in ~870ms on my MacBook Pro, 2.5 GHz Intel Core i7.
### Highly optimized
Generated regular expressions are highly optimized:
* duplicate sequences and character classes are reduced using quantifiers
* smart enough to use `?` conditionals when number(s) or range(s) can be positive or negative
* uses fragment caching to avoid processing the same exact string more than once
<br>
</details>
## Usage
Add this library to your javascript application with the following line of code
```js
var toRegexRange = require('to-regex-range');
```
The main export is a function that takes two integers: the `min` value and `max` value (formatted as strings or numbers).
```js
var source = toRegexRange('15', '95');
//=> 1[5-9]|[2-8][0-9]|9[0-5]
var re = new RegExp('^' + source + '$');
console.log(re.test('14')); //=> false
console.log(re.test('50')); //=> true
console.log(re.test('94')); //=> true
console.log(re.test('96')); //=> false
```
## Options
### options.capture
**Type**: `boolean`
**Deafault**: `undefined`
Wrap the returned value in parentheses when there is more than one regex condition. Useful when you're dynamically generating ranges.
```js
console.log(toRegexRange('-10', '10'));
//=> -[1-9]|-?10|[0-9]
console.log(toRegexRange('-10', '10', {capture: true}));
//=> (-[1-9]|-?10|[0-9])
```
### options.shorthand
**Type**: `boolean`
**Deafault**: `undefined`
Use the regex shorthand for `[0-9]`:
```js
console.log(toRegexRange('0', '999999'));
//=> [0-9]|[1-9][0-9]{1,5}
console.log(toRegexRange('0', '999999', {shorthand: true}));
//=> \d|[1-9]\d{1,5}
```
### options.relaxZeros
**Type**: `boolean`
**Default**: `true`
This option only applies to **negative zero-padded ranges**. By default, when a negative zero-padded range is defined, the number of leading zeros is relaxed using `-0*`.
```js
console.log(toRegexRange('-001', '100'));
//=> -0*1|0{2}[0-9]|0[1-9][0-9]|100
console.log(toRegexRange('-001', '100', {relaxZeros: false}));
//=> -0{2}1|0{2}[0-9]|0[1-9][0-9]|100
```
<details>
<summary><strong>Why are zeros relaxed for negative zero-padded ranges by default?</strong></summary>
Consider the following.
```js
var regex = toRegexRange('-001', '100');
```
_Note that `-001` and `100` are both three digits long_.
In most zero-padding implementations, only a single leading zero is enough to indicate that zero-padding should be applied. Thus, the leading zeros would be "corrected" on the negative range in the example to `-01`, instead of `-001`, to make total length of each string no greater than the length of the largest number in the range (in other words, `-001` is 4 digits, but `100` is only three digits).
If zeros were not relaxed by default, you might expect the resulting regex of the above pattern to match `-001` - given that it's defined that way in the arguments - _but it wouldn't_. It would, however, match `-01`. This gets even more ambiguous with large ranges, like `-01` to `1000000`.
Thus, we relax zeros by default to provide a more predictable experience for users.
</details>
## Examples
| **Range** | **Result** | **Compile time** |
| --- | --- | --- |
| `toRegexRange('5, 5')` | `5` | _33μs_ |
| `toRegexRange('5, 6')` | `5\|6` | _53μs_ |
| `toRegexRange('29, 51')` | `29\|[34][0-9]\|5[01]` | _699μs_ |
| `toRegexRange('31, 877')` | `3[1-9]\|[4-9][0-9]\|[1-7][0-9]{2}\|8[0-6][0-9]\|87[0-7]` | _711μs_ |
| `toRegexRange('111, 555')` | `11[1-9]\|1[2-9][0-9]\|[2-4][0-9]{2}\|5[0-4][0-9]\|55[0-5]` | _62μs_ |
| `toRegexRange('-10, 10')` | `-[1-9]\|-?10\|[0-9]` | _74μs_ |
| `toRegexRange('-100, -10')` | `-1[0-9]\|-[2-9][0-9]\|-100` | _49μs_ |
| `toRegexRange('-100, 100')` | `-[1-9]\|-?[1-9][0-9]\|-?100\|[0-9]` | _45μs_ |
| `toRegexRange('001, 100')` | `0{2}[1-9]\|0[1-9][0-9]\|100` | _158μs_ |
| `toRegexRange('0010, 1000')` | `0{2}1[0-9]\|0{2}[2-9][0-9]\|0[1-9][0-9]{2}\|1000` | _61μs_ |
| `toRegexRange('1, 2')` | `1\|2` | _10μs_ |
| `toRegexRange('1, 5')` | `[1-5]` | _24μs_ |
| `toRegexRange('1, 10')` | `[1-9]\|10` | _23μs_ |
| `toRegexRange('1, 100')` | `[1-9]\|[1-9][0-9]\|100` | _30μs_ |
| `toRegexRange('1, 1000')` | `[1-9]\|[1-9][0-9]{1,2}\|1000` | _52μs_ |
| `toRegexRange('1, 10000')` | `[1-9]\|[1-9][0-9]{1,3}\|10000` | _47μs_ |
| `toRegexRange('1, 100000')` | `[1-9]\|[1-9][0-9]{1,4}\|100000` | _44μs_ |
| `toRegexRange('1, 1000000')` | `[1-9]\|[1-9][0-9]{1,5}\|1000000` | _49μs_ |
| `toRegexRange('1, 10000000')` | `[1-9]\|[1-9][0-9]{1,6}\|10000000` | _63μs_ |
## Heads up!
**Order of arguments**
When the `min` is larger than the `max`, values will be flipped to create a valid range:
```js
toRegexRange('51', '29');
```
Is effectively flipped to:
```js
toRegexRange('29', '51');
//=> 29|[3-4][0-9]|5[0-1]
```
**Steps / increments**
This library does not support steps (increments). A pr to add support would be welcome.
## History
### v2.0.0 - 2017-04-21
**New features**
Adds support for zero-padding!
### v1.0.0
**Optimizations**
Repeating ranges are now grouped using quantifiers. rocessing time is roughly the same, but the generated regex is much smaller, which should result in faster matching.
## Attribution
Inspired by the python library [range-regex](https://github.com/dimka665/range-regex).
## About
### Related projects
* [expand-range](https://www.npmjs.com/package/expand-range): Fast, bash-like range expansion. Expand a range of numbers or letters, uppercase or lowercase. See… [more](https://github.com/jonschlinkert/expand-range) | [homepage](https://github.com/jonschlinkert/expand-range "Fast, bash-like range expansion. Expand a range of numbers or letters, uppercase or lowercase. See the benchmarks. Used by micromatch.")
* [fill-range](https://www.npmjs.com/package/fill-range): Fill in a range of numbers or letters, optionally passing an increment or `step` to… [more](https://github.com/jonschlinkert/fill-range) | [homepage](https://github.com/jonschlinkert/fill-range "Fill in a range of numbers or letters, optionally passing an increment or `step` to use, or create a regex-compatible range with `options.toRegex`")
* [micromatch](https://www.npmjs.com/package/micromatch): Glob matching for javascript/node.js. A drop-in replacement and faster alternative to minimatch and multimatch. | [homepage](https://github.com/jonschlinkert/micromatch "Glob matching for javascript/node.js. A drop-in replacement and faster alternative to minimatch and multimatch.")
* [repeat-element](https://www.npmjs.com/package/repeat-element): Create an array by repeating the given value n times. | [homepage](https://github.com/jonschlinkert/repeat-element "Create an array by repeating the given value n times.")
* [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.")
### Contributing
Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
### 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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/*!
* to-regex-range <https://github.com/jonschlinkert/to-regex-range>
*
* Copyright (c) 2015, 2017, Jon Schlinkert.
* Released under the MIT License.
*/
'use strict';
var repeat = require('repeat-string');
var isNumber = require('is-number');
var cache = {};
function toRegexRange(min, max, options) {
if (isNumber(min) === false) {
throw new RangeError('toRegexRange: first argument is invalid.');
}
if (typeof max === 'undefined' || min === max) {
return String(min);
}
if (isNumber(max) === false) {
throw new RangeError('toRegexRange: second argument is invalid.');
}
options = options || {};
var relax = String(options.relaxZeros);
var shorthand = String(options.shorthand);
var capture = String(options.capture);
var key = min + ':' + max + '=' + relax + shorthand + capture;
if (cache.hasOwnProperty(key)) {
return cache[key].result;
}
var a = Math.min(min, max);
var b = Math.max(min, max);
if (Math.abs(a - b) === 1) {
var result = min + '|' + max;
if (options.capture) {
return '(' + result + ')';
}
return result;
}
var isPadded = padding(min) || padding(max);
var positives = [];
var negatives = [];
var tok = {min: min, max: max, a: a, b: b};
if (isPadded) {
tok.isPadded = isPadded;
tok.maxLen = String(tok.max).length;
}
if (a < 0) {
var newMin = b < 0 ? Math.abs(b) : 1;
var newMax = Math.abs(a);
negatives = splitToPatterns(newMin, newMax, tok, options);
a = tok.a = 0;
}
if (b >= 0) {
positives = splitToPatterns(a, b, tok, options);
}
tok.negatives = negatives;
tok.positives = positives;
tok.result = siftPatterns(negatives, positives, options);
if (options.capture && (positives.length + negatives.length) > 1) {
tok.result = '(' + tok.result + ')';
}
cache[key] = tok;
return tok.result;
}
function siftPatterns(neg, pos, options) {
var onlyNegative = filterPatterns(neg, pos, '-', false, options) || [];
var onlyPositive = filterPatterns(pos, neg, '', false, options) || [];
var intersected = filterPatterns(neg, pos, '-?', true, options) || [];
var subpatterns = onlyNegative.concat(intersected).concat(onlyPositive);
return subpatterns.join('|');
}
function splitToRanges(min, max) {
min = Number(min);
max = Number(max);
var nines = 1;
var stops = [max];
var stop = +countNines(min, nines);
while (min <= stop && stop <= max) {
stops = push(stops, stop);
nines += 1;
stop = +countNines(min, nines);
}
var zeros = 1;
stop = countZeros(max + 1, zeros) - 1;
while (min < stop && stop <= max) {
stops = push(stops, stop);
zeros += 1;
stop = countZeros(max + 1, zeros) - 1;
}
stops.sort(compare);
return stops;
}
/**
* Convert a range to a regex pattern
* @param {Number} `start`
* @param {Number} `stop`
* @return {String}
*/
function rangeToPattern(start, stop, options) {
if (start === stop) {
return {pattern: String(start), digits: []};
}
var zipped = zip(String(start), String(stop));
var len = zipped.length, i = -1;
var pattern = '';
var digits = 0;
while (++i < len) {
var numbers = zipped[i];
var startDigit = numbers[0];
var stopDigit = numbers[1];
if (startDigit === stopDigit) {
pattern += startDigit;
} else if (startDigit !== '0' || stopDigit !== '9') {
pattern += toCharacterClass(startDigit, stopDigit);
} else {
digits += 1;
}
}
if (digits) {
pattern += options.shorthand ? '\\d' : '[0-9]';
}
return { pattern: pattern, digits: [digits] };
}
function splitToPatterns(min, max, tok, options) {
var ranges = splitToRanges(min, max);
var len = ranges.length;
var idx = -1;
var tokens = [];
var start = min;
var prev;
while (++idx < len) {
var range = ranges[idx];
var obj = rangeToPattern(start, range, options);
var zeros = '';
if (!tok.isPadded && prev && prev.pattern === obj.pattern) {
if (prev.digits.length > 1) {
prev.digits.pop();
}
prev.digits.push(obj.digits[0]);
prev.string = prev.pattern + toQuantifier(prev.digits);
start = range + 1;
continue;
}
if (tok.isPadded) {
zeros = padZeros(range, tok);
}
obj.string = zeros + obj.pattern + toQuantifier(obj.digits);
tokens.push(obj);
start = range + 1;
prev = obj;
}
return tokens;
}
function filterPatterns(arr, comparison, prefix, intersection, options) {
var res = [];
for (var i = 0; i < arr.length; i++) {
var tok = arr[i];
var ele = tok.string;
if (options.relaxZeros !== false) {
if (prefix === '-' && ele.charAt(0) === '0') {
if (ele.charAt(1) === '{') {
ele = '0*' + ele.replace(/^0\{\d+\}/, '');
} else {
ele = '0*' + ele.slice(1);
}
}
}
if (!intersection && !contains(comparison, 'string', ele)) {
res.push(prefix + ele);
}
if (intersection && contains(comparison, 'string', ele)) {
res.push(prefix + ele);
}
}
return res;
}
/**
* Zip strings (`for in` can be used on string characters)
*/
function zip(a, b) {
var arr = [];
for (var ch in a) arr.push([a[ch], b[ch]]);
return arr;
}
function compare(a, b) {
return a > b ? 1 : b > a ? -1 : 0;
}
function push(arr, ele) {
if (arr.indexOf(ele) === -1) arr.push(ele);
return arr;
}
function contains(arr, key, val) {
for (var i = 0; i < arr.length; i++) {
if (arr[i][key] === val) {
return true;
}
}
return false;
}
function countNines(min, len) {
return String(min).slice(0, -len) + repeat('9', len);
}
function countZeros(integer, zeros) {
return integer - (integer % Math.pow(10, zeros));
}
function toQuantifier(digits) {
var start = digits[0];
var stop = digits[1] ? (',' + digits[1]) : '';
if (!stop && (!start || start === 1)) {
return '';
}
return '{' + start + stop + '}';
}
function toCharacterClass(a, b) {
return '[' + a + ((b - a === 1) ? '' : '-') + b + ']';
}
function padding(str) {
return /^-?(0+)\d/.exec(str);
}
function padZeros(val, tok) {
if (tok.isPadded) {
var diff = Math.abs(tok.maxLen - String(val).length);
switch (diff) {
case 0:
return '';
case 1:
return '0';
default: {
return '0{' + diff + '}';
}
}
}
return val;
}
/**
* Expose `toRegexRange`
*/
module.exports = toRegexRange;

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{
"_args": [
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"to-regex-range@2.1.1",
"/Users/eric/repos/actions/setup-node"
]
],
"_development": true,
"_from": "to-regex-range@2.1.1",
"_id": "to-regex-range@2.1.1",
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"_location": "/to-regex-range",
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"_requested": {
"type": "version",
"registry": true,
"raw": "to-regex-range@2.1.1",
"name": "to-regex-range",
"escapedName": "to-regex-range",
"rawSpec": "2.1.1",
"saveSpec": null,
"fetchSpec": "2.1.1"
},
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"_spec": "2.1.1",
"_where": "/Users/eric/repos/actions/setup-node",
"author": {
"name": "Jon Schlinkert",
"url": "https://github.com/jonschlinkert"
},
"bugs": {
"url": "https://github.com/micromatch/to-regex-range/issues"
},
"dependencies": {
"is-number": "^3.0.0",
"repeat-string": "^1.6.1"
},
"description": "Pass two numbers, get a regex-compatible source string for matching ranges. Validated against more than 2.78 million test assertions.",
"devDependencies": {
"fill-range": "^3.1.1",
"gulp-format-md": "^0.1.12",
"mocha": "^3.2.0",
"text-table": "^0.2.0",
"time-diff": "^0.3.1"
},
"engines": {
"node": ">=0.10.0"
},
"files": [
"index.js"
],
"homepage": "https://github.com/micromatch/to-regex-range",
"keywords": [
"alpha",
"alphabetical",
"bash",
"brace",
"date",
"expand",
"expansion",
"glob",
"match",
"matches",
"matching",
"number",
"numerical",
"range",
"ranges",
"regex",
"sequence",
"sh",
"to",
"year"
],
"license": "MIT",
"main": "index.js",
"name": "to-regex-range",
"repository": {
"type": "git",
"url": "git+https://github.com/micromatch/to-regex-range.git"
},
"scripts": {
"test": "mocha"
},
"verb": {
"related": {
"list": [
"expand-range",
"fill-range",
"micromatch",
"repeat-element",
"repeat-string"
]
},
"toc": false,
"layout": "default",
"tasks": [
"readme"
],
"plugins": [
"gulp-format-md"
],
"lint": {
"reflinks": true
},
"helpers": [
"./examples.js"
],
"reflinks": [
"0-5",
"0-9",
"1-5",
"1-9"
]
},
"version": "2.1.1"
}