This is a post I made the other day, just have another question. I tweaked it to disallow numbers less than 7 digits or more than 10 now. How can I make it so it can't match 1 aasdasd 2 adasddsa 3 adsadbbf 4 asdasd 5 6 7? It matches numbers that are separated by anything, I need to make sure they AREN'T. They can be separated with () or spaces or a ., but not letters. 
my %seen;
open(FILE, '<', 'file.txt') or die "Unable to open file.txt for readin
+g, $!";
while (<FILE>) {
  chomp;
  tr/0-9//cd;

if (length $_ >=7 && length $_ <= 10)
{
  $_ = sprintf("%010s", $_);
  $_ =~ s/(\d{3})(\d{3})(\d{4})/$1-$2-$3/;
  $seen{$_}++;
}

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In reply to phone number regex (new question) by Anonymous Monk

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