The "without using a regex" really smells like homework, unless there's more motivation for it. As the other examples have shown here, most people would simply use a regex. What do you find disturbing about using such?
-- Randal L. Schwartz, Perl hacker
Update: ok, so it may or may not be homework. But I'm still confused about why people ask for pessimized solutions. I really had a legitimate curiousity about the unstated motivation to use something other than an optimal solution. So far, I only know of ignorance, homework, or a hidden subtext to be reasons. This might have been something else, but I don't know until I ask.
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