in reply to Web Address Validation
If this assignment were part of an obfuscation contest, I would say this:
$_=$,;$,=$/;$/=$_;$_=<DATA>;print/([-_a-z_-]+)\x2eco(?:m|m?\x2e[a-z][a +-z])\s/gi; __DATA__ http://www.tesco.com http://www.mmu.ac.uk http://www.amazon.com http:/ +/www.ikea.co.uk http://plus.maths.org
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In Section
Seekers of Perl Wisdom