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274 lines
9.4 KiB
274 lines
9.4 KiB
# Path-to-RegExp
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> Turn a path string such as `/user/:name` into a regular expression.
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[![NPM version][npm-image]][npm-url]
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[![Build status][travis-image]][travis-url]
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[![Test coverage][coveralls-image]][coveralls-url]
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[![Dependency Status][david-image]][david-url]
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[![License][license-image]][license-url]
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[![Downloads][downloads-image]][downloads-url]
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## Installation
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```
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npm install path-to-regexp --save
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```
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## Usage
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```javascript
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const { pathToRegexp, match, parse, compile } = require("path-to-regexp");
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// pathToRegexp(path, keys?, options?)
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// match(path)
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// parse(path)
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// compile(path)
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```
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- **path** A string, array of strings, or a regular expression.
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- **keys** An array to populate with keys found in the path.
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- **options**
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- **sensitive** When `true` the regexp will be case sensitive. (default: `false`)
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- **strict** When `true` the regexp allows an optional trailing delimiter to match. (default: `false`)
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- **end** When `true` the regexp will match to the end of the string. (default: `true`)
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- **start** When `true` the regexp will match from the beginning of the string. (default: `true`)
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- **delimiter** The default delimiter for segments. (default: `'/'`)
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- **endsWith** Optional character, or list of characters, to treat as "end" characters.
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- **whitelist** List of characters to consider delimiters when parsing. (default: `undefined`, any character)
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```javascript
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const keys = [];
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const regexp = pathToRegexp("/foo/:bar", keys);
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// regexp = /^\/foo\/([^\/]+?)\/?$/i
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// keys = [{ name: 'bar', prefix: '/', delimiter: '/', optional: false, repeat: false, pattern: '[^\\/]+?' }]
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```
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**Please note:** The `RegExp` returned by `path-to-regexp` is intended for ordered data (e.g. pathnames, hostnames). It can not handle arbitrarily ordered data (e.g. query strings, URL fragments, JSON, etc).
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### Parameters
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The path argument is used to define parameters and populate the list of keys.
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#### Named Parameters
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Named parameters are defined by prefixing a colon to the parameter name (`:foo`). By default, the parameter will match until the next prefix (e.g. `[^/]+`).
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```js
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const regexp = pathToRegexp("/:foo/:bar");
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// keys = [{ name: 'foo', prefix: '/', ... }, { name: 'bar', prefix: '/', ... }]
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regexp.exec("/test/route");
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//=> [ '/test/route', 'test', 'route', index: 0, input: '/test/route', groups: undefined ]
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```
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**Please note:** Parameter names must use "word characters" (`[A-Za-z0-9_]`).
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#### Parameter Modifiers
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##### Optional
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Parameters can be suffixed with a question mark (`?`) to make the parameter optional.
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```js
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const regexp = pathToRegexp("/:foo/:bar?");
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// keys = [{ name: 'foo', ... }, { name: 'bar', delimiter: '/', optional: true, repeat: false }]
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regexp.exec("/test");
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//=> [ '/test', 'test', undefined, index: 0, input: '/test', groups: undefined ]
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regexp.exec("/test/route");
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//=> [ '/test/route', 'test', 'route', index: 0, input: '/test/route', groups: undefined ]
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```
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**Tip:** The prefix is also optional, escape the prefix `\/` to make it required.
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##### Zero or more
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Parameters can be suffixed with an asterisk (`*`) to denote a zero or more parameter matches. The prefix is used for each match.
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```js
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const regexp = pathToRegexp("/:foo*");
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// keys = [{ name: 'foo', delimiter: '/', optional: true, repeat: true }]
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regexp.exec("/");
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//=> [ '/', undefined, index: 0, input: '/', groups: undefined ]
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regexp.exec("/bar/baz");
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//=> [ '/bar/baz', 'bar/baz', index: 0, input: '/bar/baz', groups: undefined ]
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```
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##### One or more
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Parameters can be suffixed with a plus sign (`+`) to denote a one or more parameter matches. The prefix is used for each match.
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```js
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const regexp = pathToRegexp("/:foo+");
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// keys = [{ name: 'foo', delimiter: '/', optional: false, repeat: true }]
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regexp.exec("/");
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//=> null
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regexp.exec("/bar/baz");
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//=> [ '/bar/baz','bar/baz', index: 0, input: '/bar/baz', groups: undefined ]
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```
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#### Unnamed Parameters
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It is possible to write an unnamed parameter that only consists of a matching group. It works the same as a named parameter, except it will be numerically indexed.
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```js
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const regexp = pathToRegexp("/:foo/(.*)");
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// keys = [{ name: 'foo', ... }, { name: 0, ... }]
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regexp.exec("/test/route");
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//=> [ '/test/route', 'test', 'route', index: 0, input: '/test/route', groups: undefined ]
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```
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#### Custom Matching Parameters
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All parameters can have a custom regexp, which overrides the default match (`[^/]+`). For example, you can match digits or names in a path:
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```js
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const regexpNumbers = pathToRegexp("/icon-:foo(\\d+).png");
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// keys = [{ name: 'foo', ... }]
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regexpNumbers.exec("/icon-123.png");
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//=> ['/icon-123.png', '123']
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regexpNumbers.exec("/icon-abc.png");
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//=> null
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const regexpWord = pathToRegexp("/(user|u)");
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// keys = [{ name: 0, ... }]
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regexpWord.exec("/u");
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//=> ['/u', 'u']
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regexpWord.exec("/users");
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//=> null
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```
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**Tip:** Backslashes need to be escaped with another backslash in JavaScript strings.
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### Match
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The `match` function will return a function for transforming paths into parameters:
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```js
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const match = match("/user/:id");
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match("/user/123"); //=> { path: '/user/123', index: 0, params: { id: '123' } }
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match("/invalid"); //=> false
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```
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### Normalize Pathname
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The `normalizePathname` function will return a normalized string for matching with `pathToRegexp`:
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```js
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const re = pathToRegexp("/caf\u00E9");
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const input = encodeURI("/caf\u00E9");
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re.test(input); //=> false
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re.test(normalizePathname(input)); //=> true
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```
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**Note:** It may be preferable to implement something in your own library that normalizes the pathname for matching. E.g. [`URL`](https://developer.mozilla.org/en-US/docs/Web/API/URL) automatically URI encodes paths for you, which would result in a consistent match.
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**Tip:** Consider using [`String.prototype.normalize`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/normalize) to resolve unicode variants of the same string.
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### Parse
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The `parse` function will return a list of strings and keys from a path string:
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```js
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const tokens = parse("/route/:foo/(.*)");
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console.log(tokens[0]);
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//=> "/route"
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console.log(tokens[1]);
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//=> { name: 'foo', prefix: '/', delimiter: '/', optional: false, repeat: false, pattern: '[^\\/]+?' }
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console.log(tokens[2]);
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//=> { name: 0, prefix: '/', delimiter: '/', optional: false, repeat: false, pattern: '.*' }
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```
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**Note:** This method only works with strings.
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### Compile ("Reverse" Path-To-RegExp)
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The `compile` function will return a function for transforming parameters into a valid path:
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```js
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const toPath = compile("/user/:id");
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toPath({ id: 123 }); //=> "/user/123"
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toPath({ id: "café" }); //=> "/user/caf%C3%A9"
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toPath({ id: "/" }); //=> "/user/%2F"
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toPath({ id: ":/" }); //=> "/user/%3A%2F"
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toPath({ id: ":/" }, { encode: (value, token) => value, validate: false }); //=> "/user/:/"
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const toPathRepeated = compile("/:segment+");
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toPathRepeated({ segment: "foo" }); //=> "/foo"
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toPathRepeated({ segment: ["a", "b", "c"] }); //=> "/a/b/c"
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const toPathRegexp = compile("/user/:id(\\d+)");
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toPathRegexp({ id: 123 }); //=> "/user/123"
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toPathRegexp({ id: "123" }); //=> "/user/123"
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toPathRegexp({ id: "abc" }); //=> Throws `TypeError`.
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toPathRegexp({ id: "abc" }, { validate: false }); //=> "/user/abc"
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```
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**Note:** The generated function will throw on invalid input. It will do all necessary checks to ensure the generated path is valid. This method only works with strings.
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### Working with Tokens
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Path-To-RegExp exposes the two functions used internally that accept an array of tokens.
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- `tokensToRegexp(tokens, keys?, options?)` Transform an array of tokens into a matching regular expression.
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- `tokensToFunction(tokens)` Transform an array of tokens into a path generator function.
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#### Token Information
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- `name` The name of the token (`string` for named or `number` for unnamed index)
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- `prefix` The prefix character for the segment (e.g. `/`)
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- `delimiter` The delimiter for the segment (same as prefix or default delimiter)
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- `optional` Indicates the token is optional (`boolean`)
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- `repeat` Indicates the token is repeated (`boolean`)
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- `pattern` The RegExp used to match this token (`string`)
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## Compatibility with Express <= 4.x
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Path-To-RegExp breaks compatibility with Express <= `4.x`:
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- RegExp special characters can only be used in a parameter
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- Express.js 4.x supported `RegExp` special characters regardless of position - this is considered a bug
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- Parameters have suffixes that augment meaning - `*`, `+` and `?`. E.g. `/:user*`
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- No wildcard asterisk (`*`) - use parameters instead (`(.*)` or `:splat*`)
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## Live Demo
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You can see a live demo of this library in use at [express-route-tester](http://forbeslindesay.github.com/express-route-tester/).
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## License
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MIT
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[npm-image]: https://img.shields.io/npm/v/path-to-regexp.svg?style=flat
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[npm-url]: https://npmjs.org/package/path-to-regexp
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[travis-image]: https://img.shields.io/travis/pillarjs/path-to-regexp.svg?style=flat
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[travis-url]: https://travis-ci.org/pillarjs/path-to-regexp
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[coveralls-image]: https://img.shields.io/coveralls/pillarjs/path-to-regexp.svg?style=flat
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[coveralls-url]: https://coveralls.io/r/pillarjs/path-to-regexp?branch=master
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[david-image]: http://img.shields.io/david/pillarjs/path-to-regexp.svg?style=flat
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[david-url]: https://david-dm.org/pillarjs/path-to-regexp
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[license-image]: http://img.shields.io/npm/l/path-to-regexp.svg?style=flat
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[license-url]: LICENSE.md
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[downloads-image]: http://img.shields.io/npm/dm/path-to-regexp.svg?style=flat
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[downloads-url]: https://npmjs.org/package/path-to-regexp
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