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$ perl  testRegexen.pl
Benchmark: running capture, noCapture, noParens, twoRegexen for at lea
+st 3 CPU seconds...
   capture:  4 wallclock secs ( 3.20 usr +  0.00 sys =  3.20 CPU) @ 14
+1750.00/s (n=453600)
...
noCapture  279933/s        97%         7%         --       -48%
twoRegexen 540171/s       281%       106%        93%         --
$

$ perl -Dr testRegexen.pl
Compiling REx `(est|\d)'
size 10 Got 84 bytes for offset annotations.
...
EXECUTING...

$