I offer this optimization:

tr/[]<>.,+-//cd;
s/(([+-])\2*)/P$2=@{[length$1]};/g;
s/(([<>])\2*)/Q@{[('+','-')[$2eq'<']]}=@{[length$1]};/g;
s/\./print chrP;/g;
s/,/P=ord getc;/g;
s/\[/while(P){/g;
s/]/}/g;
s/P/\$m[Q]/g;
s/Q/\$p/g;
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japhy -- Perl and Regex Hacker