How to replace numbers in phone numbers in notepad++?

Question

Regular Expressions

there are different numbers, 8 800 ... 7 900 (in a column) for example, I need a format where all numbers start with 7ok

Answer 1

If the phone is at the beginning of the line, then:
Find: ^(\s*)8(\s)
Replace with:\17\2

spoiler

Answer 2

not looking (