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in reply to Regexp: not what I'd expected
Everyone else has answered the "Why did this happen?" questions,
so I'll go for the "What book..." question. _Mastering
Regular Expressions_ by Jeffrey Friedl is still the standard,
even though it's a bit dated by now. It may also be more
than you need.
Fortunately, perl comes with a whole boatload of documentation
for free. perldoc perlop first to read about the m// and s///
operators and their flags, and then perldoc perlre to get
hip deep in Perl regexes.
Enjoy!
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