I've gone with hdb's suggestion in the other node with the nested foreach loops but I simplified the hash definition to

$haystack{"$a, $b, $c"} =  \@zeros;

I reversed the hash after reading that in perl, hashes are optimized for searching the keys, so now the \@zeros are the keys. But they're arrays, at least in my head. I'm used to thinking in terms of vectors, sets of ordered pairs, etc & not strings or whatever.

I'm interested in the keys that only contain integers so the "something" I was thinking of using a regex like this

/ (.*\.0000.*)|(.*\.9999.*) /

because that would find floats with the right form. It's just I'm not sure what to put in the grep to make sure I'm getting only @zeros that have ALL integers inside & not just at least one. I wouldn't hve thought to use more than one grep like Don Coyote though. Maybe I need to learn more about grep... & then after finding a slice with the right keys, print out the corresponding values. But it's the grep part that I'm stuck on.

In reply to Re^2: question about what to grep(?) by crunch_this!
in thread question about what to grep(?) by crunch_this!

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