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For perl5.10

perl -Mre=debug -e "qr/a .{1,10} \ /x;qr/a .{1,10} [ ]/x;"

gives

Compiling REx "a .{1,10} \ " Final program: 1: EXACT <a> (3) 3: CURLY {1,10} (6) 5: REG_ANY (0) 6: EXACT < > (8) 8: END (0) anchored "a" at 0 floating " " at 2..11 (checking floating) minlen 3 Compiling REx "a .{1,10} [ ]" Final program: 1: EXACT <a> (3) 3: CURLY {1,10} (6) 5: REG_ANY (0) 6: EXACT < > (8) 8: END (0)

So the two compile to the identical program under 5.10. And indeed, when I take out class_nodot, I get:

Rate literal class literal 531978/s -- -1% class 539600/s 1% --

In reply to Re^3: The cost of unchecked best practices by Corion
in thread The cost of unchecked best practices by moritz

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