Regex for urls without http, https, ftp

Try this this will validate url with (http,ftp,https) or without(http,ftp,https)..

/^(?:(ftp|http|https):\/\/)?(?:[\w-]+\.)+[a-z]{3,6}$/;

Make the (ftp|http|https):\/\/ part optional:

((ftp|http|https):\/\/)?

Try this this will validate url with or without(http,ftp,https) in upper and lower cases and also allows you to for numerics

/^(?:(ftp|http|https)?:\/\/)?(?:[\w-]+\.)+([a-z]|[A-Z]|[0-9]){2,6}$/gi;