A simple regex based exhaustive validator for PIN codes in India
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india-pincode-regex/README.md

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# india-pincode-regex ![Packagist Version](https://img.shields.io/packagist/v/captn3m0/pincode?style=plastic) [![Build Status](https://travis-ci.org/captn3m0/india-pincode-regex.svg?branch=master)](https://travis-ci.org/captn3m0/india-pincode-regex) ![npm](https://img.shields.io/npm/v/pincode-validator?style=plastic) ![GitHub package.json version](https://img.shields.io/github/package-json/v/captn3m0/india-pincode-regex?style=plastic) ![GitHub](https://img.shields.io/github/license/captn3m0/india-pincode-regex?style=plastic)
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Validate a [Postal Index Number][wiki] for India with a few regexes and zero false-positives. The regexes are available in `regex.txt`. There is one regex per area code (the first digit of the PIN, which goes from 1-8). Available as a package for Ruby, Python, Node.js, and browsers.
## Why?
A simple `\d{6}` approach marks a lot of invalid pincodes as valid. Out of the 900000 possible combinations, only approximately `155600` are valid pincodes in India. A simple example is `111111` which is an invalid pincode, but any simple 6 digit-check will pass it as a valid one. File a PR to support any other language.
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## Source
The source for the data is the ["All India Pincode Directory"](https://data.gov.in/resources/all-india-pincode-directory) dataset on data.gov.in. The last updated date for the dataset is currently 30th May 2019.
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## Usage
The `regex.txt` file is 32KB in size, so you can easily use it wherever you want, including browsers. If you are using any of the packages below, this is already delivered compressed.
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### PHP
The package is available on [`packagist`](https://packagist.org/packages/captn3m0/pincode).
To use the PHP package:
```php
use PIN\Validator as P;
P::validate('110011'); // returns true;
```
### Node.js
The package is available on [`npm`](https://www.npmjs.com/package/pincode-validator).
To use the package:
```js
const P = require('pincode-validator');
P.validate('110011'); // returns true
````
## Ruby
Add this line to your application's Gemfile:
```ruby
gem 'pincode_validator'
```
And then execute:
$ bundle
Or install it yourself as:
$ gem install pincode_validator
### Browser
To use it in the browser, download the `pincode-regex.js` file and include it in your browser. `Pincode` is available as a Global variable.
```html
<script src="../pincode-regex.js"></script>
<script>
Pincode.validate("560029"); // returns true
</script>
```
Since there is no hotline/CDN for this yet, please watch to repo to get notified of new releases.
## Code of Conduct
Everyone interacting in the this project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the [code of conduct](https://github.com/captn3m0/outliner/blob/master/CODE_OF_CONDUCT.md).
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## Contributing
- See [`HACKING.md`](HACKING.md) for some development details.
- Pull requests are welcome for adding libraries in other languages (in the same repo).
- This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.
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## License
Licensed under the [MIT License](https://nemo.mit-license.org/). See LICENSE file for details.
[wiki]: https://en.wikipedia.org/wiki/Postal_Index_Number