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  • Try Regexhero.net its good tool for testing your expressions. Commented Mar 7, 2014 at 9:06
  • Try this one : (?:[a-zA-Z]{8,11}\d+) Commented Mar 7, 2014 at 9:10
  • If you want more accurate answer. you should paste some examples. Commented Mar 7, 2014 at 9:11