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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 ```
What does this do?
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).
Why use this library?
### 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
## 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 ```
Why are zeros relaxed for negative zero-padded ranges by default? 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.
## 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._