Please no ,
I think
He wants a formatting mask :
999-9999999-9999999
3 + 7 + 7 digits
Post’s Title :
"How to use 123-4567890-1011123 this Format "
And watch vídeo… 
https://medium.com/factory-mind/regex-tutorial-a-simple-cheatsheet-by-examples-649dc1c3f285