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1# to-regex [![NPM version](https://img.shields.io/npm/v/to-regex.svg?style=flat)](https://www.npmjs.com/package/to-regex) [![NPM monthly downloads](https://img.shields.io/npm/dm/to-regex.svg?style=flat)](https://npmjs.org/package/to-regex) [![NPM total downloads](https://img.shields.io/npm/dt/to-regex.svg?style=flat)](https://npmjs.org/package/to-regex) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/to-regex.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/to-regex)
2
3> Generate a regex from a string or array of strings.
4
5Please consider following this project's author, [Jon Schlinkert](https://github.com/jonschlinkert), and consider starring the project to show your :heart: and support.
6
7- [Install](#install)
8- [Usage](#usage)
9- [Options](#options)
10 * [options.contains](#optionscontains)
11 * [options.negate](#optionsnegate)
12 * [options.nocase](#optionsnocase)
13 * [options.flags](#optionsflags)
14 * [options.cache](#optionscache)
15 * [options.safe](#optionssafe)
16- [About](#about)
17 * [Related projects](#related-projects)
18 * [Author](#author)
19 * [License](#license)
20
21_(TOC generated by [verb](https://github.com/verbose/verb) using [markdown-toc](https://github.com/jonschlinkert/markdown-toc))_
22
23## Install
24
25Install with [npm](https://www.npmjs.com/):
26
27```sh
28$ npm install --save to-regex
29```
30
31## Usage
32
33```js
34var toRegex = require('to-regex');
35
36console.log(toRegex('foo'));
37//=> /^(?:foo)$/
38
39console.log(toRegex('foo', {negate: true}));
40//=> /^(?:(?:(?!^(?:foo)$).)*)$/
41
42console.log(toRegex('foo', {contains: true}));
43//=> /(?:foo)/
44
45console.log(toRegex(['foo', 'bar'], {negate: true}));
46//=> /^(?:(?:(?!^(?:(?:foo)|(?:bar))$).)*)$/
47
48console.log(toRegex(['foo', 'bar'], {negate: true, contains: true}));
49//=> /^(?:(?:(?!(?:(?:foo)|(?:bar))).)*)$/
50```
51
52## Options
53
54### options.contains
55
56**Type**: `Boolean`
57
58**Default**: `undefined`
59
60Generate a regex that will match any string that _contains_ the given pattern. By default, regex is strict will only return true for exact matches.
61
62```js
63var toRegex = require('to-regex');
64console.log(toRegex('foo', {contains: true}));
65//=> /(?:foo)/
66```
67
68### options.negate
69
70**Type**: `Boolean`
71
72**Default**: `undefined`
73
74Create a regex that will match everything except the given pattern.
75
76```js
77var toRegex = require('to-regex');
78console.log(toRegex('foo', {negate: true}));
79//=> /^(?:(?:(?!^(?:foo)$).)*)$/
80```
81
82### options.nocase
83
84**Type**: `Boolean`
85
86**Default**: `undefined`
87
88Adds the `i` flag, to enable case-insensitive matching.
89
90```js
91var toRegex = require('to-regex');
92console.log(toRegex('foo', {nocase: true}));
93//=> /^(?:foo)$/i
94```
95
96Alternatively you can pass the flags you want directly on [options.flags](#options.flags).
97
98### options.flags
99
100**Type**: `String`
101
102**Default**: `undefined`
103
104Define the flags you want to use on the generated regex.
105
106```js
107var toRegex = require('to-regex');
108console.log(toRegex('foo', {flags: 'gm'}));
109//=> /^(?:foo)$/gm
110console.log(toRegex('foo', {flags: 'gmi', nocase: true})); //<= handles redundancy
111//=> /^(?:foo)$/gmi
112```
113
114### options.cache
115
116**Type**: `Boolean`
117
118**Default**: `true`
119
120Generated regex is cached based on the provided string and options. As a result, runtime compilation only happens once per pattern (as long as options are also the same), which can result in dramatic speed improvements.
121
122This also helps with debugging, since adding options and pattern are added to the generated regex.
123
124**Disable caching**
125
126```js
127toRegex('foo', {cache: false});
128```
129
130### options.safe
131
132**Type**: `Boolean`
133
134**Default**: `undefined`
135
136Check the generated regular expression with [safe-regex](https://github.com/substack/safe-regex) and throw an error if the regex is potentially unsafe.
137
138**Examples**
139
140```js
141console.log(toRegex('(x+x+)+y'));
142//=> /^(?:(x+x+)+y)$/
143
144// The following would throw an error
145toRegex('(x+x+)+y', {safe: true});
146```
147
148## About
149
150<details>
151<summary><strong>Contributing</strong></summary>
152
153Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
154
155</details>
156
157<details>
158<summary><strong>Running Tests</strong></summary>
159
160Running 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:
161
162```sh
163$ npm install && npm test
164```
165
166</details>
167
168<details>
169<summary><strong>Building docs</strong></summary>
170
171_(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.)_
172
173To generate the readme, run the following command:
174
175```sh
176$ npm install -g verbose/verb#dev verb-generate-readme && verb
177```
178
179</details>
180
181### Related projects
182
183You might also be interested in these projects:
184
185* [has-glob](https://www.npmjs.com/package/has-glob): Returns `true` if an array has a glob pattern. | [homepage](https://github.com/jonschlinkert/has-glob "Returns `true` if an array has a glob pattern.")
186* [is-glob](https://www.npmjs.com/package/is-glob): Returns `true` if the given string looks like a glob pattern or an extglob pattern… [more](https://github.com/jonschlinkert/is-glob) | [homepage](https://github.com/jonschlinkert/is-glob "Returns `true` if the given string looks like a glob pattern or an extglob pattern. This makes it easy to create code that only uses external modules like node-glob when necessary, resulting in much faster code execution and initialization time, and a bet")
187* [path-regex](https://www.npmjs.com/package/path-regex): Regular expression for matching the parts of a file path. | [homepage](https://github.com/regexps/path-regex "Regular expression for matching the parts of a file path.")
188* [to-regex-range](https://www.npmjs.com/package/to-regex-range): Pass two numbers, get a regex-compatible source string for matching ranges. Validated against more than… [more](https://github.com/micromatch/to-regex-range) | [homepage](https://github.com/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.")
189
190### Author
191
192**Jon Schlinkert**
193
194* [linkedin/in/jonschlinkert](https://linkedin.com/in/jonschlinkert)
195* [github/jonschlinkert](https://github.com/jonschlinkert)
196* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
197
198### License
199
200Copyright © 2018, [Jon Schlinkert](https://github.com/jonschlinkert).
201Released under the [MIT License](LICENSE).
202
203***
204
205_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on February 24, 2018._
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