var releaseRegex = /release (..)/ var codenameRegex = /\((.*)\)/ module.exports = function fedoraCustomLogic (os, file, cb) { var release = file.match(releaseRegex) if (release && release.length === 2) os.release = release[1] var codename = file.match(codenameRegex) if (codename && codename.length === 2) os.codename = codename[1] cb(null, os) }