Winner by a nose! Thanks merlyn.

Actually it's a lot better. When I saw how quickly this will return undef, I realized my benchmarking sucks. I have been benching only on successful matches.

On success:

l_merlyn: 16 wallclock secs (15.60 usr + 0.00 sys = 15.60 CPU) @ 6564.10/s (n=102400)
leftover: 16 wallclock secs (15.74 usr + 0.00 sys = 15.74 CPU) @ 6505.72/s (n=102400)

On failure:

l_merlyn: 1 wallclock secs ( 1.11 usr + 0.00 sys = 1.11 CPU) @ 9225.23/s (n=10240)
leftover: 45 wallclock secs (45.12 usr + 0.00 sys = 45.12 CPU) @ 226.95/s (n=10240)

I should have remembered how slow !~ m// can be.
Definitely the optimization I was looking for!

In reply to Re: Re: Difference Of Two Strings by YuckFoo
in thread Difference Of Two Strings by YuckFoo

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