Your article is so great I declared it mandatory reading for our developers and interns :) There's only one point I'd discuss, it's the "always use exceptions" rule. Exceptions suffer exceptions :), for instance for programs that mustn't die whatever happens (daemons, GUI tools for complex jobs, etc).
And concerning the 8th perl coding practice ( Always use the /x ,/m , and /s flags, and the \A and \z anchors.): could you explain it a bit?
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