perl -ne '/^root:\s*/ and $_ !~ /admin\@somewhere\.here/ and print' alias
That's ok, but I want to understand that blah-blah-look-ahead thing
perl -ne '/^root:(?!\s*admin\@somewhere\.here)/ and print' alias
This works! But I can't understand why it doesn't work if you put the \s* outside the parens, nor I can understand why it stops working if I put the \s*$ at the end of the regex :-(
Thanks a lot
In theory, there is no difference between theory and practice. In practice, there is.