$a !=~ m#1#;
$a !=~/1/;
$a !=~ ?/?;
+$a !=~ y/1//;
+$a !=~ tr/1//;
+$a !=~ s/1//;
$a != ~/1/;
no warnings "syntax";
$a !=~ /1/;
$a !=~ m#1#;
$a !=~/1/;
$a !=~ ?/?;
+$a !=~ y/1//;
+$a !=~ tr/1//;
+$a !=~ s/1//;
EXPECT
!=~ should be !~ at - line 4.
!=~ should be !~ at - line 5.
!=~ should be !~ at - line 6.
!=~ should be !~ at - line 7.
+!=~ should be !~ at - line 8.
+!=~ should be !~ at - line 9.
+!=~ should be !~ at - line 10.