A slight simplification. I'm not sure the  \G is necessary: the given test string produces the same groups with/without it. (Update: And the same caveat about a regex solution possibly not being optimum.) See Extended Patterns in perlre. 

>perl -wMstrict -le
"my $s = '79899920179';
 ;;
 my @n = $s =~ m{ \G (\d{2,3}?) (?(?{ $^N < 32 }) (*FAIL)) }xmsg;
 printf qq{'$_' } for @n;
"
'79' '89' '99' '201' '79'

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In reply to Re^2: how to split the string into two or three numbers based on certain value. by AnomalousMonk
in thread how to split the string into two or three numbers based on certain value. by venky4289

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