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  • License MIT

Returns a regex-compatible range from two numbers, min and max. Useful for creating regular expressions to validate numbers, ranges, years, etc. Returns a string, allowing the returned value to be used in regular expressions generated by other libraries.

Package Exports

  • to-regex-range

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Readme

to-regex-range NPM version

Returns a regex-compatible range from two numbers, min and max. Useful for creating regular expressions to validate numbers, ranges, years, etc. Returns a string, allowing the returned value to be used in regular expressions generated by other libraries.

Inspired by the python lib range-regex, it has never been easier to validate numbers and number ranges with regex!

The unit tests generate millions of patterns to provide brute-force validation that the generated regex-ranges are correct.

Install

Install with npm

$ npm i to-regex-range --save

Install with bower

$ bower install to-regex-range --save

Usage

var toRegexRange = require('to-regex-range');

var re = new RegExp(toRegexRange('1', '99'));
re.test('50');
//=> true

Examples

toRegexRange('111', '555');
//=> '11[1-9]|1[2-9]\d|[2-4]\d{2}|5[0-4]\d|55[0-5]'
toRegexRange('5', '5');
//=> '5'
toRegexRange('5', '6');
//=> '[5-6]'
toRegexRange('51', '229');
//=> '5[1-9]|[6-9]\d|1\d{2}|2[0-2]\d'

When the min is larger than the max, a regex logical or is returned:

toRegexRange('51', '29');
//=> '51|29'

Currently this does not support steps (increments) or zero-padding.

  • expand-range: Fast, bash-like range expansion. Expand a range of numbers or letters, uppercase or lowercase. See… more
  • fill-range: Fill in a range of numbers or letters, optionally passing an increment or multiplier to… more
  • micromatch: Glob matching for javascript/node.js. A drop-in replacement and faster alternative to minimatch and multimatch. Just… more
  • repeat-element: Create an array by repeating the given value n times.
  • repeat-string: Repeat the given string n times. Fastest implementation for repeating a string.

Running tests

Install dev dependencies:

$ npm i -d && npm test

Contributing

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

Author

Jon Schlinkert

License

Copyright © 2015 Jon Schlinkert Released under the MIT license.

This file was generated by verb-cli on August 07, 2015.