[TUHS] Regular Expressions

[Rob Pike]

Ken's grep for Plan 9 beats them all.

% time /usr/local/plan9/bin/grep -c . /tmp/x

39536274


real 0m1.731s

user 0m1.568s

sys 0m0.158s

% time /usr/bin/egrep -c . /tmp/x

39536274


real 0m9.798s

user 0m9.644s

sys 0m0.153s

%


% time /usr/local/plan9/bin/grep -c '(ab|cd)' /tmp/x

1023171


real 0m1.719s

user 0m1.560s

sys 0m0.158s

% time /usr/bin/egrep -c '(ab|cd)' /tmp/x

1023171


real 0m32.692s

user 0m32.525s
sys 0m0.166s-rob
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