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use strict;
use warnings;
...
sub using_set_nomatch {
    ($no_match =~ /ba[rz]/) ? 1 : 0
}

using_or_index 1
using_or_noindex 0
...
using_or_match    804828/s             8204%           6399%          
+    21%              15%               15%             --            
+-2%            -10%
using_or_index    825420/s             8417%           6565%          
+    24%              18%               18%             3%            
+ --             -8%
using_set_match   898573/s             9172%           7155%          
+    35%              29%               28%            12%            
+ 9%              --