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 is a different length and has different characters so cant use anything as delimiters.

Answer 1

You can use a regular expression in the search and replace-dialog (Ctrl+H) that is anchored to the end of the line:

.{13}$

Then replace it with nothing. And of course you could use a more expressive regex to match only dates in your particular format and nothing else.