const fs = require('fs'); const package = JSON.parse(fs.readFileSync(`./package.json`, { encoding: 'utf-8' })); const original = fs.readFileSync(`./index.html`, { encoding: 'utf-8' }); let out = original.replace(/RELEASE_INFO-(\S)+-RELEASE_INFO/gi, 'RELEASE_INFO-' + package.version + '-RELEASE_INFO'); fs.writeFileSync(`./index.html`, out);