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$ perl -E 'say $]'
5.032001

$ perl -Mstrict -wE 'my $str = "foobar"; say 1 if $str =~ /[o]{1,2}/'
1

$ perl -Mstrict -wE 'my $str = "foobar"; say 1 if $str =~ /[o]{,2}/'
Unescaped left brace in regex is illegal here in regex; marked by <-- 
+HERE in m/[o]{ <-- HERE ,2}/ at -e line 1.