Or even just this: 

$SUM += /$regex/;

[download]

Update: Sorry, mine only counts the number of matches (like grep -c). To accumulate the values of matches, I still instinctively reach for (something like) this: 

nawk '/([0-9]*)/{tot+=$1}END{print tot}' file

[download]

In reply to Re^2: reset of match variables by hbm
in thread reset of match variables by morgon

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