Extract last K characters from a string in Perl -


I have a string that looks like this 

  my $ str1 = "ACGGATATTGA" ; My $ str2 = "alex";

What do I have to do to remove the last three letters from each of those? 

  $ out1 = "TGA"; $ Out2 = "lex";

How can I do this in Perl?

Usage:

$ out1 = substr ($ str1, - 3);

-

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