> Currently I feel the regex solution is interesting, but still not my first choice. I'll dig deeper if I start profiling.

For completeness.

Another approach would be combining a binary search with string equality eq if your priorities tend towards performance.

Of course you could change to a division factor other than 0.5 depending on heuristics.

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

In reply to Re^5: CPAN Module to determing overlap of 2 lists? by LanX
in thread CPAN Module to determing overlap of 2 lists? by wazat

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