Regular Expression Expert - Simple Task

Job ID: 32615351

Budget: $10 – $30 USD

Looking for a regular expression expert to solve the following task without using any language such as Javascript, Python, etc.
Only can use regular expression.

Given string (Phone number): "(xxx) xxx-xxxx"
Remove special characters and then filter our only numbers
The final result should be "xxxxxxxxxx".

You can test your solution on the following site.
https://www.regex101.com