为什么在Perl中的字符串插值期间,变量名后跟下划线未正确计算？
my $i = 3; print "i = $i\n"; # works,prints "i = 3" print "_i = _$i\n"; # works,prints "_i = _3" print "i_ = $i_\n"; # FAILS,prints "i_ = " print "_i_ = _$i_\n"; # sort of works,prints "_i_ = _"