const Path = require('path') const fs = require('fs') let target = process.argv[2] let path = Path.isAbsolute(target) ? target : Path.join(process.cwd(), target) let out = fs.readFileSync(path).toString('utf-8').replaceAll( / <\w+ .*? id='([a-z_]+)' fill='#([A-Za-z0-9]+)'><\/\w+>/g, '@$1: #$2;' ) .split('\n').filter(line => line.startsWith('@')).join('\n') console.log(out)