i'm looking at a piece of code and trying understand it, but i get stuck at this point. please help and explain what the following lines mean. Thanks. 
while($seq =~/(ATG)(...)*?(?=TAA|TAG|TGA)/og){
$start = length($');
}

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i've never run into code like this, though my knowledge of perl isn't that deep either. Thanks.

In reply to explanation of code pls by imlou

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