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Re Line 23, you MAY speed things up a little by reading $wordfile directly into a hash. Searching Google for +Perl +'file to hash' produces some relevant results in prior discussions here in the Monastery. Strike the site specification and you'll find some other sources (albeit, of unknown reliability).

Even with a wordlist of the size you're using, that runtime seems far to the high-side. Is the box upon which you're writing this reasonably current (fast?) and what version of Perl are you using?

Counting the first para above, you now have three reasonable alternatives (update: and one very reasonable question about the precision of your spec </update>) ... so the rest of this node will focus on some nits.

Line 4 seems to reflect a view that $datapath and $wordfile are constants. While you're using them within the scope of the conventional meaning of "constant," they aren't in the sense of allowing the compiler to optomize.

Lines 9 and 10 declare global variables... not, IMO, as major problem here, but in more complex programs, it's wise to declare them in such a way as to minimize their scope (for more on this, try perldoc -q scope at your CLI).

Your comment at Line 26 reflect what is actually ( IMO, usually [...additional qualifiers may be required] ) a better (if not "best") practice. The more complex you make your regex, the more opportunities you'll have to obscure a logic problem and/or to create something that sets the regex engine thrashing.

In reply to Re: Words in Words by ww
in thread Words in Words by sarchasm

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    [1nickt]: It sounds fantastic but this is third time I've tried it, and this time I have created minimal test scripts, thinking that perhaps my use of subtests was confusing it, and still no joy. All that happens is the order in which the tests are run is reversed.
    [1nickt]: Hmph. Does not leave me very hopeful about --rules which I was really looking forward to profiting from.

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