#!/usr/bin/perl
my $str = "Extract all words but word1 and word2.";
@list = ($str =~ m/\b(?!(?:word1|word2)\b)(\w+)/g);
IyEvdXNyL2Jpbi9wZXJsCgpteSAkc3RyID0gIkV4dHJhY3QgYWxsIHdvcmRzIGJ1dCB3b3JkMSBhbmQgd29yZDIuIjsKQGxpc3QgPSAoJHN0ciA9fiBtL1xiKD8hKD86d29yZDF8d29yZDIpXGIpKFx3KykvZyk7CnByaW50KGpvaW4gIlxuIiwgQGxpc3QpOwo=