I added the line start anchor as I wanted to match whole lines.

Agreed, assuming text files, a more "binary" marker is better.

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

In reply to Re^4: CPAN Module to determing overlap of 2 lists? by wazat
in thread CPAN Module to determing overlap of 2 lists? by wazat

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