I am doing following: 
$mod = "ABC ";
$hier = `tac temp.xx | sed -n '/$mod /,/YYY/ p'| grep XXX`;

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But nothing gets captured in $hier. When i execute this in shell on the same file, i get proper o/p: 
 %tac temp.xx | sed -n '/ABC /,/YYY/ p' | grep XXX
XXX ZZZZ

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What i am trrying to do: Search for a string "ABC " in the file Back track till i find "YYY" Print that line w YYY

In reply to Sed in perl by abhay180

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