pattern matching for serial number

[Kamali Muthukrishnan]

Hi guys :
I have serial numbers with a pattern : 3 numbers followed by 2 capital letters 
followed by 3 numbers.
To validate this -
  if ($serial !~ m/[0-9]{3}[A-Z]{2}[0-9]{3} )
      {  # display error ;  }
I get a syntax error.
Can you help me , please ?
Kamali


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