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‎README.md‎

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> A compiled-away, type-safe, readable RegExp alternative
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- [✨  Changelog](https://github.com/danielroe/magic-regexp/blob/main/CHANGELOG.md)
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- [📖  Documentation](https://magic-regexp.roe.dev)
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- [▶️  Online playground](https://stackblitz.com/github/danielroe/magic-regexp/tree/main/playground)
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## Features
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- Packed with useful utilities: `charIn`, `charNotIn`, `anyOf`, `char`, `word`, `digit`, `whitespace`, `letter`, `tab`, `linefeed`, `carriageReturn`, `not`, `maybe`, `exactly`, `oneOrMore`
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- All chainable with `and`, `or`, `after`, `before`, `notAfter`, `notBefore`, `times`, `as`, `at`, `optionally`
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**Future ideas**
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- [ ] More TypeScript guard-rails
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- [ ] More complex RegExp features/syntax
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- [ ] Instrumentation for accurately getting coverage on RegExps
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- [ ] Hybrid/partially-compiled RegExps for better dynamic support
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## Setup
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Install package:
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```sh
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# npm
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npm install magic-regexp
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# yarn
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yarn add magic-regexp
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# pnpm
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pnpm install magic-regexp
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```
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```js
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import { createRegExp, exactly } from 'magic-regexp'
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const regExp = createRegExp(exactly('foo/test.js').after('bar/'))
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console.log(regExp)
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// /(?<=bar\/)foo\/test\.js/
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```
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## Usage
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Every pattern you create with the library should be wrapped in `createRegExp`. It also takes a second argument, which is an array of flags.
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```js
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import { createRegExp, global, multiline } from 'magic-regexp'
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createRegExp('string-to-match', [global, multiline])
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// you can also pass flags directly as strings
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createRegExp('string-to-match', ['g', 'm'])
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```
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> **Note**
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> By default, all helpers from `magic-regexp` assume that input that is passed should be escaped - so no special RegExp characters apply. So `createRegExp('foo?\d')` will not match `food3` but only `foo?\d` exactly.
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There are a range of helpers that can be used to activate pattern matching, and they can be chained.
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They are:
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- `charIn`, `charNotIn` - this matches or doesn't match any character in the string provided.
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- `anyOf` - this takes an array of inputs and matches any of them.
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- `char`, `word`, `digit`, `whitespace`, `letter`, `tab`, `linefeed` and `carriageReturn` - these are helpers for specific RegExp characters.
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- `not` - this can prefix `word`, `digit`, `whitespace`, `letter`, `tab`, `linefeed` or `carriageReturn`. For example `createRegExp(not.letter)`.
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- `maybe` - equivalent to `?` - this marks the input as optional.
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- `oneOrMore` - equivalent to `+` - this marks the input as repeatable, any number of times but at least once.
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- `exactly` - this escapes a string input to match it exactly.
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All of these helpers return an object of type `Input` that can be chained with the following helpers:
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- `and` - this adds a new pattern to the current input.
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- `or` - this provides an alternative to the current input.
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- `after`, `before`, `notAfter` and `notBefore` - these activate positive/negative lookahead/lookbehinds. Make sure to check [browser support](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#browser_compatibility) as not all browsers support lookbehinds (notably Safari).
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- `times` - this is a function you can call directly to repeat the previous pattern an exact number of times, or you can use `times.between(min, max)` to specify a range, `times.atLeast(num)` to indicate it must repeat x times or `times.any()` to indicate it can repeat any number of times, _including none_.
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- `optionally` - this is a function you can call to mark the current input as optional.
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- `as` - this defines the entire input so far as a named capture group. You will get type safety when using the resulting RegExp with `String.match()`.
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- `at` - this allows you to match beginning/ends of lines with `at.lineStart()` and `at.lineEnd()`.
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## Compilation at build
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The best way to use `magic-regexp` is by making use of the included transform.
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```js
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const regExp = createRegExp(exactly('foo/test.js').after('bar/'))
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// => gets _compiled_ to
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const regExp = /(?<=bar\/)foo\/test\.js/
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```
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Of course, this only works with non-dynamic regexps. Within the `createRegExp` block you have to include all the helpers you are using from `magic-regexp` - and not rely on any external variables. This, for example, will not statically compile into a RegExp, although it will still continue to work with a minimal runtime:
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```js
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const someString = 'test'
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const regExp = createRegExp(exactly(someString))
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```
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### Nuxt
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```js
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import { defineNuxtConfig } from 'nuxt'
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// https://v3.nuxtjs.org/api/configuration/nuxt.config
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export default defineNuxtConfig({
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// This will also enable auto-imports of magic-regexp helpers
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modules: ['magic-regexp/nuxt'],
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})
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```
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### Vite
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```js
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import { defineConfig } from 'vite'
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import { MagicRegExpTransformPlugin } from 'magic-regexp/transform'
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export default defineConfig({
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plugins: [MagicRegExpTransformPlugin.vite()],
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})
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```
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### Next.js
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For Next, you will need to ensure you are using `next.config.mjs` or have set `"type": "module"` in your `package.json.
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```js
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import { MagicRegExpTransformPlugin } from 'magic-regexp/transform'
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export default {
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webpack(config) {
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config.plugins = config.plugins || []
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config.plugins.push(MagicRegExpTransformPlugin.webpack())
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return config
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},
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}
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```
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### unbuild
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```js
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import { defineBuildConfig } from 'unbuild'
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import { MagicRegExpTransformPlugin } from 'magic-regexp/transform'
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export default defineBuildConfig({
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hooks: {
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'rollup:options': (options, config) => {
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config.plugins.push(MagicRegExpTransformPlugin.rollup())
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},
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},
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})
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```
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## Examples
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```js
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import { createRegExp, exactly, oneOrMore, digit } from 'magic-regexp'
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// Quick-and-dirty semver
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createRegExp(
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oneOrMore(digit)
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.as('major')
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.and('.')
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.and(oneOrMore(digit).as('minor'))
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.and(exactly('.').and(oneOrMore(char).as('patch')).optionally())
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)
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// /(?<major>(\d)+)\.(?<minor>(\d)+)(\.(?<patch>(.)+))?/
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```
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[📖 &nbsp;Read more](https://magic-regexp.roe.dev)
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## 💻 Development
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‎docs/.env.example‎

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# Create one with no scope selected on https://github.com/settings/tokens/new
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# This token is used for fetching the repository releases.
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GITHUB_TOKEN=

‎docs/.gitignore‎

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.env
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.nuxt
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.output

‎docs/.npmrc‎

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shamefully-hoist=true

‎docs/components/content/Logo.vue‎

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<template>
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<div class="font-bold flex flex-row items-center gap-2">🦄 magic-regexp</div>
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</template>

‎docs/content/1.index.md‎

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---
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title: 'Welcome'
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description: 'A compiled-away, type-safe, readable RegExp alternative'
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layout: fluid
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navigation: false
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---
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::block-hero
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---
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cta:
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- Get Started
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- /getting-started/setup
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secondary:
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- Star on GitHub
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- https://github.com/danielroe/magic-regexp
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snippet: npm install magic-regexp
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---
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#title
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🦄 magic-regexp
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#description
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A compiled-away, type-safe, readable RegExp alternative.
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#extra
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::list
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- Runtime is zero-dependency and ultra-minimal
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- Ships with transform to compile to pure RegExp
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- Automatically typed capture groups
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- Natural language syntax
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- Generated RegExp displays on hover
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::
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::

‎docs/content/2.getting-started/1.setup.md‎

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---
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title: Setup
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description: Install magic-regexp from npm and (optionally) enable the build-time transform via a plugin.
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---
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First, install `magic-regexp`:
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::code-group
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```sh [npm]
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npm install magic-regexp
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```
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```sh [yarn]
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yarn add magic-regexp
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```
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```sh [pnpm]
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pnpm install magic-regexp
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```
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::
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---
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Second, optionally, you can enable the included transform, [which enables zero-runtime usage](/getting-started/usage#build-time-transform).
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::code-group
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```js [nuxt.config.ts]
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// Nuxt 3
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import { defineNuxtConfig } from 'nuxt'
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export default defineNuxtConfig({
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// This will also enable auto-imports of magic-regexp helpers
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modules: ['magic-regexp/nuxt'],
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})
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```
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```js [vite.config.ts]
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// For Vite, you will need to ensure you are using `vite.config.mjs`
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// or have set `"type": "module"` in your `package.json.
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import { defineConfig } from 'vite'
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import { MagicRegExpTransformPlugin } from 'magic-regexp/transform'
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export default defineConfig({
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plugins: [MagicRegExpTransformPlugin.vite()],
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})
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```
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```js [next.config.mjs]
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// For Next, you will need to ensure you are using `next.config.mjs`
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// or have set `"type": "module"` in your `package.json.
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import { MagicRegExpTransformPlugin } from 'magic-regexp/transform'
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export default {
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webpack(config) {
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config.plugins = config.plugins || []
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config.plugins.push(MagicRegExpTransformPlugin.webpack())
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return config
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},
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}
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```
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::
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<!--
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TODO: https://github.com/unjs/unbuild/issues/92
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```js [build.config.ts ]
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// unbuild
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import { defineBuildConfig } from 'unbuild'
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import { MagicRegExpTransformPlugin } from 'magic-regexp/transform'
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export default defineBuildConfig({
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hooks: {
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'rollup:options': (options, config) => {
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config.plugins.push(MagicRegExpTransformPlugin.rollup())
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},
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},
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})
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``` -->

‎docs/content/2.getting-started/2.usage.md‎

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---
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title: Usage
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---
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```js
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import { createRegExp, exactly } from 'magic-regexp'
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const regExp = createRegExp(exactly('foo/test.js').after('bar/'))
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console.log(regExp)
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// /(?<=bar\/)foo\/test\.js/
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```
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## createRegExp
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Every pattern you create with the library should be wrapped in `createRegExp`, which enables the build-time transform.
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The first argument is either a string to match exactly, or an input pattern built up using helpers from `magic-regexp`. It also takes a second argument, which is an array of flags or flags string.
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```js
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import { createRegExp, global, multiline, exactly } from 'magic-regexp'
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createRegExp(exactly('foo').or('bar'))
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createRegExp('string-to-match', [global, multiline])
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// you can also pass flags directly as strings or Sets
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createRegExp('string-to-match', ['g', 'm'])
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```
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::alert
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By default, all helpers from `magic-regexp` assume that input that is passed should be escaped - so no special RegExp characters apply. So `createRegExp('foo?\d')` will not match `food3` but only `foo?\d` exactly.
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::
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## Creating inputs
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There are a range of helpers that can be used to activate pattern matching, and they can be chained. Each one of these returns an object of type `Input` that can be passed directly to `new RegExp`, `createRegExp`, to another helper or chained to produce more complex patterns.
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| | |
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| --------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------- |
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| `charIn`, `charNotIn` | this matches or doesn't match any character in the string provided. |
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| `anyOf` | this takes an array of inputs and matches any of them. |
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| `char`, `word`, `digit`, `whitespace`, `letter`, `tab`, `linefeed` and `carriageReturn` | these are helpers for specific RegExp characters. |
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| `not` | this can prefix `word`, `digit`, `whitespace`, `letter`, `tab`, `linefeed` or `carriageReturn`. For example `createRegExp(not.letter)`. |
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| `maybe` | equivalent to `?` - this marks the input as optional. |
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| `oneOrMore` | Equivalent to `+` - this marks the input as repeatable, any number of times but at least once. |
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| `exactly` | This escapes a string input to match it exactly. |
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## Chaining inputs
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All of the helpers above return an object of type `Input` that can be chained with the following helpers:
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| | |
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| --------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| `and` | this adds a new pattern to the current input. |
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| `or` | this provides an alternative to the current input. |
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| `after`, `before`, `notAfter` and `notBefore` | these activate positive/negative lookahead/lookbehinds. Make sure to check [browser support](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#browser_compatibility) as not all browsers support lookbehinds (notably Safari). |
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| `times` | this is a function you can call directly to repeat the previous pattern an exact number of times, or you can use `times.between(min, max)` to specify a range, `times.atLeast(num)` to indicate it must repeat x times or `times.any()` to indicate it can repeat any number of times, _including none_. |
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| `optionally` | this is a function you can call to mark the current input as optional. |
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| `as` | this defines the entire input so far as a named capture group. You will get type safety when using the resulting RegExp with `String.match()`. |
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| `at` | this allows you to match beginning/ends of lines with `at.lineStart()` and `at.lineEnd()`. |
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## Debugging
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When using `magic-regexp`, a TypeScript generic is generated for you that should show the RegExp that you are constructing, as you go.
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This is true not just for the final RegExp, but also for the pieces you create along the way.
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So, for example:
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```ts
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import { exactly } from 'magic-regexp'
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exactly('test.mjs')
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// (alias) exactly<"test.mjs">(input: "test.mjs"): Input<"test\\.mjs", never>
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exactly('test.mjs').or('something.else')
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// (property) Input<"test\\.mjs", never>.or: <"something.else">(input: "something.else") => Input<"(test\\.mjs|something\\.else)", never>
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```
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Each function, if you hover over it, shows what's going in, and what's coming out by way of regular expression
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You can also call `.toString()` on any input to see the same information at runtime.

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