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  1. or download this
    if ($who !~ /[A-Za-z]/) ...  # thanks to eric256 to point out the prob
+lem
if ($who2 !~ /[A-Za-z]/) ... # in my regexp. I really meant to use a n
+egative
                             # regexp. If any character not alphabetic
+al. ^_^
  2. or download this
    if ($email =~ /@/) ...
  3. or download this
    if ($creditcard =~ /^\d{16}$/) ...