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use strict;
use warnings;
...
        }
    },
});

Benchmark: timing 100000 iterations ...
alternation, grouping: 12 wallclock secs (11.92 usr +  0.00 sys = 11.9
+2 CPU) @ 8389.26/s (n=100000)
alternation, no grouping:  0 wallclock secs ( 0.19 usr +  0.00 sys =  
+0.19 CPU) @ 526315.79/s (n=100000)
            (warning: too few iterations for a reliable count)
loop, grouping:  2 wallclock secs ( 1.33 usr +  0.00 sys =  1.33 CPU) 
+@ 75187.97/s (n=100000)
loop, no grouping:  1 wallclock secs ( 1.33 usr +  0.00 sys =  1.33 CP
+U) @ 75187.97/s (n=100000)