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sub func {
   'b' =~ /(.)/;
...

'a' =~ /(.)/;  func($1);    # Prints "b"
'a' =~ /(.)/;  func("$1");  # Prints "a"

sub func {
   eval { die "bar\n" };
...

eval { die "foo\n" };  func($@);    # Prints "bar"
eval { die "foo\n" };  func("$@");  # Prints "foo"