This regex patterns allows to parse rinex 2 filesnames/filepath it follows the directory structure usually found on FTP servers from main GNSS CORS stations networks / monitoring organizations (e.g. ftp://rgpdata.ign.fr/pub/data)

^(?:20-4|25[0-5]|1?[0-9]?[0-9]).[0-9]|25[0-5]|1?[0-9]?[0-9]).[0-9]|25[0-5]|1?[0-9]?[0-9]).[0-9]|25[0-5]|1?[0-9]?[0-9])$mgs

YYYYMMDD YYYY-MM-DD YYYY.MM.DD YYYY/MM/DD YYYY-M-D YYYY.M.D...

Ensure the ip address format is correct

for quadratic equations ||ax^2+bx+c=d||

Pruebas iniciales

const regex = /(?:Mobile|Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera\sMobi)/gm; const str = `Mozilla/5.0 (Android; Mobile; rv:13.0) Gecko/13.0 Firefox/13.0 Mozilla/5.0 (Linux; U; Android 4.0.3; de-ch; HTC Sensation Build/IML74K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile...