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  1. or download this
    #Find all instances of specific five character strings 
#starts with 4, then 3 more numbers, then a letter)
chomp $line;
if ($line =~ /(4\d{4})/){
  2. or download this
    /(4\d{3}[a-z]/i
  3. or download this
    /\b(4\d{3}[a-z])\b/i