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  1. or download this
    
0-9 - all numbers
...
@ - the at sign
# - the comment character
^ - this guy
  2. or download this
    
my $STR1 = '///?///';
...
print "\n" . ($STR1 =~ /(\d\w.\/~-_!@#$%\^&{}\(\).'`)/);
print "\n" . ($STR2 =~ /(\d\w.\/~-_!@#$%\^&{}\(\).'`)/);