1. Number seq. with min 9 and max 15 digits. Like 145-1256-2365-789
2. First 3 and Last 3 should be numbers not diffrentiators. Like 123-1545645-123
3. Match can also be without a diffrentiator like 123456789147
4. The diffrentiator(same throughout sequence) can come any number of times between the first and last 3 digits until the min and max length criteria is satisfied. Like 1213-456-789-1265