Regex: remove www. from domain name only for domain-strings whit two or more dots

Question

Have a real domain names like www.by or www.ru, so for such domains I wanna keep "www.". But for other domains, like www.example.org or www.sub.example.org "www." need to be removed.

I have tried regex such ^(www[0-9]*\.)(\.*){2,} but is not working... Have any ideas?

Answer 1

You can use

^www[0-9]*\.((?:[^.]*\.)+)

Replace with $1 . See the regex demo . Details :

• ^ - start of string
• www[0-9]*\. - www , any zero or more digits, and a .
• ((?:[^.]*\.)+) - Group 1 ( $1 refers to this value from the replacement pattern): one or more occurrences of zero or more chars other than a . and then a . char.

Answer 2

You can replace matches of the following regular expression with empty strings:

^www\d*\.(?=.*\.)

The positive lookahead (?=.*\.) asserts that the first period is followed later in the string by another period.

Demo