in reply to internal engine of regular expression
Heh, as soon as you find some documentation on how Perls regex engine works be sure to send it to the perl5porters mailing list. I believe there is certain level of consensus that the regex engine implementation is one of the most difficult and minimally documented part of Perl.
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$world=~s/war/peace/g
$world=~s/war/peace/g
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In Section
Seekers of Perl Wisdom