How to write a regular expression (Nodepad++)?

Question

Regular Expressions

It is necessary to pull out phone numbers from the mass of code, text, etc. Numbers can be of the following types:

[phone]
[phone]
8 000 000-00-00
70000000000
8000 000 00 00

Etc. Perhaps these are not all options.

I tried it with Notepad++. I found an example of a regular expression ((8|\+7)[\- ]?)?(\(?\d{3}\)?[\- ]?)?[\d\- ]{7,10}on the Internet, but for some reason it does not find it.