How to remove the last 13 (or n) characters of every line using Notepad++

Question

I have a file which each line that ends with Mar 15, 2013 and other dates so I need to remove the end of each line say the last 13 characters

Each line

Answer 1

As others already said, use a regex search in the search and replace dialogue (ctrl + h) with the pattern the dates follow. Given your example this should do:

[A-Za-z]{3}\s(\d){1,2},\s?\d{4}$

Replace with empty string.