$ANS=1234 ;
$count = $ANS =~ tr/1234// ;
print "$count\n";
请问tr后面有办法带入自己想要的变量吗？
google了好久
$ANS=1234 ;
print "Please enter your number.\n";
chomp ($num=<STDIN>);
$count = $ANS =~ tr/// ;
print "$count\n";
tr后面该怎么改才有办法让＄num带入