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[~] $ perl -Mre=debug -wle'"x" =~ /x/'
Freeing REx: `,'
Compiling REx `x'
...
   1 <x> <>               | 10:  END
Match successful!
Freeing REx: `[x]'

[~] $ perl -MBenchmark -we'timethese(-5,{x=>q{"x"=~/x/},"[x]"=>q{"x"=~
+/[x]/}})'
Benchmark: running [x], x, each for at least 5 CPU seconds...
       [x]:  4 wallclock secs ( 5.23 usr +  0.00 sys =  5.23 CPU) @ 85
+2787.57/s (n=4460079)
         x:  6 wallclock secs ( 5.25 usr +  0.00 sys =  5.25 CPU) @ 14
+99188.19/s (n=7870738)