Re^2: Scurbbing a string

[FunkyMonk]

I always believed that there wasn't interpolation inside a character class.

++moritz

[Roy Johnson]

I would have thought the same. But you could get around it by building your RE as a string and then putting that into the s///:

my $allowed = "pure";
my $re = "[^\Q$allowed\E]";

my $str = "p uuu+tr-ed";
$str =~ s/$re//g;
print $str, "\n";