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"abbbbbc" =~ /(b)*?(b*?)c/;
print "($1)($2)\n";

()(bbbbb)

"abbbbbc" =~ /(b)*?(b*?)c/;
print "\$1: $1\n" if defined $1;
...
Prints:

$2: bbbbb

"babbbbbcbbbcx" =~ /(b*?)/;
print ">$1<\n"; # '><' - matched none

"babbbbbcbbbcx" =~ /(b*?)c/;
print ">$1<\n"; # '>bbbbb<' - matched b following a through b preceedi
+ng c