Regex get domain name from email

Question

I am learning regex and am having trouble getting google from email address

String

[email protected] 

I just want to get google, not google.com

Regex:

[^@].+(?=\.) 

Result: https://regex101.com/r/wA5eX5/1

From my understanding. It ignore @ find a string after that until . (dot) using (?=\.)

What did I do wrong?

Answer 1

[^@] means "match one symbol that is not an @ sign. That is not what you are looking for - use lookbehind (?<=@) for @ and your (?=\.) lookahead for \. to extract server name in the middle:

(?<=@)[^.]+(?=\.) 

The middle portion [^.]+ means "one or more non-dot characters".

Demo.