"Claus Busch" wrote:

ptrn = "\b[0-9]{3}-[0-9]{2}-[0-9]{4}\b"


Awesome! You got it!

Also, remember the previous phone number problem?
The pattern was "\(|\)|-|!|\d", but that erases abnormal
phone numbers such as (555)555-12345678900000.

Do you know how to fix the pattern so it precisely
only matches this format: (123)456-7890?