Hi all,

I see some codes as following

my $regexp= "(([gatc]{3})\\2{3,})";

my $string=~/$regexp/;

What is the meaning of {3,} of in  \2{3,} ?

I know \2 is a backreference here but not sure {3,}. 
I check the camel book and some perldoc but I can't
find answer.

Thanks,

Li

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