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

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Generating the regex

  1. Download the latest CSV file from https://data.gov.in/node/85839/download or https://data.gov.in/resources/all-india-pincode-directory.
  2. Copy all the pincodes to a pincodes.txt file
  3. Generate all unique pincodes by running sort -u pincodes.txt > /tmp/pin.txt
  4. npm install
  5. node src/generate.js /tmp/pin.txt > regex.txt

Generating the browser-version

  1. Make sure development dependencies are installed.
  2. npm run browserify.
  3. Test it by opening tests/index.html in your browser.

PHP Release

  1. git tag 1.2.3
  2. git push --tags