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use Data::Dumper;
my @array = (['a','b','c'],['d','e','f'],['g','h','i']);
my @index = map { $_ -> [0] } @array;
my @result = grep { $index[$_] =~ /g/ } 0..$#index;
my @result2 = map { $array[$_][0] =~ /g/ ? $_ : () } 0..$#array;
print Data::Dumper->Dump([\@array, \@result, \@result2], [qw(array result result2)]);
Compiling Program...
Standard Input:
Interactive Console
Text
Program is not being debugged. Click "Debug" button to start program in debug mode.
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