| 1 | # to-regex-range [](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=W8YFZ425KND68) [](https://www.npmjs.com/package/to-regex-range) [](https://npmjs.org/package/to-regex-range) [](https://npmjs.org/package/to-regex-range) [](https://travis-ci.org/micromatch/to-regex-range)
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| 2 |
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| 3 | > Pass two numbers, get a regex-compatible source string for matching ranges. Validated against more than 2.78 million test assertions.
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| 4 |
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| 5 | Please consider following this project's author, [Jon Schlinkert](https://github.com/jonschlinkert), and consider starring the project to show your :heart: and support.
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| 6 |
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| 7 | ## Install
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| 8 |
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| 9 | Install with [npm](https://www.npmjs.com/):
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| 10 |
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| 11 | ```sh
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| 12 | $ npm install --save to-regex-range
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| 13 | ```
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| 14 |
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| 15 | <details>
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| 16 | <summary><strong>What does this do?</strong></summary>
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| 17 |
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| 18 | <br>
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| 19 |
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| 20 | This libary generates the `source` string to be passed to `new RegExp()` for matching a range of numbers.
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| 21 |
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| 22 | **Example**
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| 23 |
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| 24 | ```js
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| 25 | const toRegexRange = require('to-regex-range');
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| 26 | const regex = new RegExp(toRegexRange('15', '95'));
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| 27 | ```
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| 28 |
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| 29 | 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).
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| 30 |
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| 31 | <br>
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| 32 |
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| 33 | </details>
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| 34 |
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| 35 | <details>
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| 36 | <summary><strong>Why use this library?</strong></summary>
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| 37 |
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| 38 | <br>
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| 39 |
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| 40 | ### Convenience
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| 41 |
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| 42 | Creating regular expressions for matching numbers gets deceptively complicated pretty fast.
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| 43 |
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| 44 | 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:
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| 45 |
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| 46 | * regex for matching `1` => `/1/` (easy enough)
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| 47 | * regex for matching `1` through `5` => `/[1-5]/` (not bad...)
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| 48 | * regex for matching `1` or `5` => `/(1|5)/` (still easy...)
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| 49 | * regex for matching `1` through `50` => `/([1-9]|[1-4][0-9]|50)/` (uh-oh...)
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| 50 | * regex for matching `1` through `55` => `/([1-9]|[1-4][0-9]|5[0-5])/` (no prob, I can do this...)
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| 51 | * 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...)
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| 52 | * 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!)
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| 53 |
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| 54 | 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.
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| 55 |
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| 56 | **Learn more**
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| 57 |
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| 58 | 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.
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| 59 |
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| 60 | ### Heavily tested
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| 61 |
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| 62 | As of April 07, 2019, this library runs [>1m test assertions](./test/test.js) against generated regex-ranges to provide brute-force verification that results are correct.
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| 63 |
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| 64 | Tests run in ~280ms on my MacBook Pro, 2.5 GHz Intel Core i7.
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| 65 |
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| 66 | ### Optimized
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| 67 |
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| 68 | Generated regular expressions are optimized:
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| 69 |
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| 70 | * duplicate sequences and character classes are reduced using quantifiers
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| 71 | * smart enough to use `?` conditionals when number(s) or range(s) can be positive or negative
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| 72 | * uses fragment caching to avoid processing the same exact string more than once
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| 73 |
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| 74 | <br>
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| 75 |
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| 76 | </details>
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| 77 |
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| 78 | ## Usage
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| 79 |
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| 80 | Add this library to your javascript application with the following line of code
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| 81 |
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| 82 | ```js
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| 83 | const toRegexRange = require('to-regex-range');
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| 84 | ```
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| 85 |
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| 86 | The main export is a function that takes two integers: the `min` value and `max` value (formatted as strings or numbers).
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| 87 |
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| 88 | ```js
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| 89 | const source = toRegexRange('15', '95');
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| 90 | //=> 1[5-9]|[2-8][0-9]|9[0-5]
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| 91 |
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| 92 | const regex = new RegExp(`^${source}$`);
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| 93 | console.log(regex.test('14')); //=> false
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| 94 | console.log(regex.test('50')); //=> true
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| 95 | console.log(regex.test('94')); //=> true
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| 96 | console.log(regex.test('96')); //=> false
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| 97 | ```
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| 98 |
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| 99 | ## Options
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| 100 |
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| 101 | ### options.capture
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| 102 |
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| 103 | **Type**: `boolean`
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| 104 |
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| 105 | **Deafault**: `undefined`
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| 106 |
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| 107 | Wrap the returned value in parentheses when there is more than one regex condition. Useful when you're dynamically generating ranges.
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| 108 |
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| 109 | ```js
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| 110 | console.log(toRegexRange('-10', '10'));
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| 111 | //=> -[1-9]|-?10|[0-9]
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| 112 |
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| 113 | console.log(toRegexRange('-10', '10', { capture: true }));
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| 114 | //=> (-[1-9]|-?10|[0-9])
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| 115 | ```
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| 116 |
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| 117 | ### options.shorthand
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| 118 |
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| 119 | **Type**: `boolean`
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| 120 |
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| 121 | **Deafault**: `undefined`
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| 122 |
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| 123 | Use the regex shorthand for `[0-9]`:
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| 124 |
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| 125 | ```js
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| 126 | console.log(toRegexRange('0', '999999'));
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| 127 | //=> [0-9]|[1-9][0-9]{1,5}
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| 128 |
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| 129 | console.log(toRegexRange('0', '999999', { shorthand: true }));
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| 130 | //=> \d|[1-9]\d{1,5}
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| 131 | ```
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| 132 |
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| 133 | ### options.relaxZeros
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| 134 |
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| 135 | **Type**: `boolean`
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| 136 |
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| 137 | **Default**: `true`
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| 138 |
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| 139 | This option relaxes matching for leading zeros when when ranges are zero-padded.
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| 140 |
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| 141 | ```js
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| 142 | const source = toRegexRange('-0010', '0010');
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| 143 | const regex = new RegExp(`^${source}$`);
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| 144 | console.log(regex.test('-10')); //=> true
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| 145 | console.log(regex.test('-010')); //=> true
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| 146 | console.log(regex.test('-0010')); //=> true
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| 147 | console.log(regex.test('10')); //=> true
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| 148 | console.log(regex.test('010')); //=> true
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| 149 | console.log(regex.test('0010')); //=> true
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| 150 | ```
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| 151 |
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| 152 | When `relaxZeros` is false, matching is strict:
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| 153 |
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| 154 | ```js
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| 155 | const source = toRegexRange('-0010', '0010', { relaxZeros: false });
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| 156 | const regex = new RegExp(`^${source}$`);
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| 157 | console.log(regex.test('-10')); //=> false
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| 158 | console.log(regex.test('-010')); //=> false
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| 159 | console.log(regex.test('-0010')); //=> true
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| 160 | console.log(regex.test('10')); //=> false
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| 161 | console.log(regex.test('010')); //=> false
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| 162 | console.log(regex.test('0010')); //=> true
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| 163 | ```
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| 164 |
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| 165 | ## Examples
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| 166 |
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| 167 | | **Range** | **Result** | **Compile time** |
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| 168 | | --- | --- | --- |
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| 169 | | `toRegexRange(-10, 10)` | `-[1-9]\|-?10\|[0-9]` | _132μs_ |
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| 170 | | `toRegexRange(-100, -10)` | `-1[0-9]\|-[2-9][0-9]\|-100` | _50μs_ |
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| 171 | | `toRegexRange(-100, 100)` | `-[1-9]\|-?[1-9][0-9]\|-?100\|[0-9]` | _42μs_ |
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| 172 | | `toRegexRange(001, 100)` | `0{0,2}[1-9]\|0?[1-9][0-9]\|100` | _109μs_ |
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| 173 | | `toRegexRange(001, 555)` | `0{0,2}[1-9]\|0?[1-9][0-9]\|[1-4][0-9]{2}\|5[0-4][0-9]\|55[0-5]` | _51μs_ |
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| 174 | | `toRegexRange(0010, 1000)` | `0{0,2}1[0-9]\|0{0,2}[2-9][0-9]\|0?[1-9][0-9]{2}\|1000` | _31μs_ |
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| 175 | | `toRegexRange(1, 50)` | `[1-9]\|[1-4][0-9]\|50` | _24μs_ |
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| 176 | | `toRegexRange(1, 55)` | `[1-9]\|[1-4][0-9]\|5[0-5]` | _23μs_ |
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| 177 | | `toRegexRange(1, 555)` | `[1-9]\|[1-9][0-9]\|[1-4][0-9]{2}\|5[0-4][0-9]\|55[0-5]` | _30μs_ |
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| 178 | | `toRegexRange(1, 5555)` | `[1-9]\|[1-9][0-9]{1,2}\|[1-4][0-9]{3}\|5[0-4][0-9]{2}\|55[0-4][0-9]\|555[0-5]` | _43μs_ |
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| 179 | | `toRegexRange(111, 555)` | `11[1-9]\|1[2-9][0-9]\|[2-4][0-9]{2}\|5[0-4][0-9]\|55[0-5]` | _38μs_ |
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| 180 | | `toRegexRange(29, 51)` | `29\|[34][0-9]\|5[01]` | _24μs_ |
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| 181 | | `toRegexRange(31, 877)` | `3[1-9]\|[4-9][0-9]\|[1-7][0-9]{2}\|8[0-6][0-9]\|87[0-7]` | _32μs_ |
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| 182 | | `toRegexRange(5, 5)` | `5` | _8μs_ |
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| 183 | | `toRegexRange(5, 6)` | `5\|6` | _11μs_ |
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| 184 | | `toRegexRange(1, 2)` | `1\|2` | _6μs_ |
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| 185 | | `toRegexRange(1, 5)` | `[1-5]` | _15μs_ |
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| 186 | | `toRegexRange(1, 10)` | `[1-9]\|10` | _22μs_ |
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| 187 | | `toRegexRange(1, 100)` | `[1-9]\|[1-9][0-9]\|100` | _25μs_ |
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| 188 | | `toRegexRange(1, 1000)` | `[1-9]\|[1-9][0-9]{1,2}\|1000` | _31μs_ |
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| 189 | | `toRegexRange(1, 10000)` | `[1-9]\|[1-9][0-9]{1,3}\|10000` | _34μs_ |
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| 190 | | `toRegexRange(1, 100000)` | `[1-9]\|[1-9][0-9]{1,4}\|100000` | _36μs_ |
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| 191 | | `toRegexRange(1, 1000000)` | `[1-9]\|[1-9][0-9]{1,5}\|1000000` | _42μs_ |
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| 192 | | `toRegexRange(1, 10000000)` | `[1-9]\|[1-9][0-9]{1,6}\|10000000` | _42μs_ |
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| 193 |
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| 194 | ## Heads up!
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| 195 |
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| 196 | **Order of arguments**
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| 197 |
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| 198 | When the `min` is larger than the `max`, values will be flipped to create a valid range:
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| 199 |
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| 200 | ```js
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| 201 | toRegexRange('51', '29');
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| 202 | ```
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| 203 |
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| 204 | Is effectively flipped to:
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| 205 |
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| 206 | ```js
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| 207 | toRegexRange('29', '51');
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| 208 | //=> 29|[3-4][0-9]|5[0-1]
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| 209 | ```
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| 210 |
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| 211 | **Steps / increments**
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| 212 |
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| 213 | This library does not support steps (increments). A pr to add support would be welcome.
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| 214 |
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| 215 | ## History
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| 216 |
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| 217 | ### v2.0.0 - 2017-04-21
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| 218 |
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| 219 | **New features**
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| 220 |
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| 221 | Adds support for zero-padding!
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| 222 |
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| 223 | ### v1.0.0
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| 224 |
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| 225 | **Optimizations**
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| 226 |
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| 227 | 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.
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| 228 |
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| 229 | ## Attribution
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| 230 |
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| 231 | Inspired by the python library [range-regex](https://github.com/dimka665/range-regex).
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| 232 |
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| 233 | ## About
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| 234 |
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| 235 | <details>
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| 236 | <summary><strong>Contributing</strong></summary>
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| 237 |
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| 238 | Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
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| 239 |
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| 240 | </details>
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| 241 |
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| 242 | <details>
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| 243 | <summary><strong>Running Tests</strong></summary>
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| 244 |
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| 245 | 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:
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| 246 |
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| 247 | ```sh
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| 248 | $ npm install && npm test
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| 249 | ```
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| 250 |
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| 251 | </details>
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| 252 |
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| 253 | <details>
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| 254 | <summary><strong>Building docs</strong></summary>
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| 255 |
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| 256 | _(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.)_
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| 257 |
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| 258 | To generate the readme, run the following command:
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| 259 |
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| 260 | ```sh
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| 261 | $ npm install -g verbose/verb#dev verb-generate-readme && verb
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| 262 | ```
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| 263 |
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| 264 | </details>
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| 265 |
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| 266 | ### Related projects
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| 267 |
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| 268 | You might also be interested in these projects:
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| 269 |
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| 270 | * [expand-range](https://www.npmjs.com/package/expand-range): Fast, bash-like range expansion. Expand a range of numbers or letters, uppercase or lowercase. Used… [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. Used by micromatch.")
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| 271 | * [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`")
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| 272 | * [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/micromatch/micromatch "Glob matching for javascript/node.js. A drop-in replacement and faster alternative to minimatch and multimatch.")
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| 273 | * [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.")
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| 274 | * [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.")
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| 275 |
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| 276 | ### Contributors
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| 277 |
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| 278 | | **Commits** | **Contributor** |
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| 279 | | --- | --- |
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| 280 | | 63 | [jonschlinkert](https://github.com/jonschlinkert) |
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| 281 | | 3 | [doowb](https://github.com/doowb) |
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| 282 | | 2 | [realityking](https://github.com/realityking) |
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| 283 |
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| 284 | ### Author
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| 285 |
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| 286 | **Jon Schlinkert**
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| 287 |
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| 288 | * [GitHub Profile](https://github.com/jonschlinkert)
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| 289 | * [Twitter Profile](https://twitter.com/jonschlinkert)
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| 290 | * [LinkedIn Profile](https://linkedin.com/in/jonschlinkert)
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| 291 |
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| 292 | Please consider supporting me on Patreon, or [start your own Patreon page](https://patreon.com/invite/bxpbvm)!
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| 293 |
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| 294 | <a href="https://www.patreon.com/jonschlinkert">
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| 295 | <img src="https://c5.patreon.com/external/logo/become_a_patron_button@2x.png" height="50">
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| 296 | </a>
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| 297 |
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| 298 | ### License
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| 299 |
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| 300 | Copyright © 2019, [Jon Schlinkert](https://github.com/jonschlinkert).
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| 301 | Released under the [MIT License](LICENSE).
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| 302 |
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| 303 | ***
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| 304 |
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| 305 | _This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.8.0, on April 07, 2019._ |
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