First of all, you can't leave out the lower bound to a quantifier. [^\d]{,7} is trying to match a non-digit, and then the text "{,7}". I suggest using \D{0,7}. (In fact, use \D instead of [^\d] in general.)

The regex I'd use would probably look like this:

m{
  ($prefix)
  \D{0,7}        
  (\d\s*){3,15}   
  (?!\d)
}gx
[download]

where $prefix is some sub-pattern that matches likely leading text.

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Jeff[japhy]Pinyan: Perl, regex, and perl hacker, who'd like a job (NYC-area)
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