You already have your answer, but here is a way to solve problems like this in the future.

Tip #9 from the Basic debugging checklist YAPE::Regex::Explain: 

The regular expression:

(?-imsx:INC[0-9]\{7\})

matches as follows:
  
NODE                     EXPLANATION
----------------------------------------------------------------------
(?-imsx:                 group, but do not capture (case-sensitive)
                         (with ^ and $ matching normally) (with . not
                         matching \n) (matching whitespace and #
                         normally):
----------------------------------------------------------------------
  INC                      'INC'
----------------------------------------------------------------------
  [0-9]                    any character of: '0' to '9'
----------------------------------------------------------------------
  \{                       '{'
----------------------------------------------------------------------
  7                        '7'
----------------------------------------------------------------------
  \}                       '}'
----------------------------------------------------------------------
)                        end of grouping
----------------------------------------------------------------------

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In reply to Re: Quick Regex Question by toolic
in thread Quick Regex Question by Anonymous Monk

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