in reply to Re^3: trim leading & trailing whitespacein thread trim leading & trailing whitespace
How about this:
$_ = " yes \n \n \n they \n \n will \n\n\n";
% perl 443391.pl
the lowliest monk
Perhaps replace the \b(.*?) with (\S.*?).
Still, you're not running this with warnings enabled, are you? Both $1 and $2 are optional, so both can be undef, but you use their value regardless. This runs without warnings:
Conway's Game of Life
Perl regular expressions
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