# -*- coding: utf-8 -*-
from __future__ import print_function

from Npp import *
import datetime as dt
import time

#-------------------------------------------------------------------------------

class T23284(object):

    def __init__(self):
        date_current = dt.datetime(*time.localtime()[:6])
        def replace_func(m):
            date_in_question = dt.datetime(*time.strptime(m.group(1), '%m/%d/%y')[:6])
            return '' if (date_current - date_in_question).days > 7 else m.group(0)
        editor.rereplace(r'(?-s)^,\d*?,\d*?,(\d{2}/\d{2}/\d{2}).*(\R|\z)', replace_func)

#-------------------------------------------------------------------------------

if __name__ == '__main__': T23284()

I have tried using the following Find/Replace expressions and settings.

It cannot be done this way, because how are you going to tell Find/Replace what “a week” means?

And why did you say “following” when nothing follows?

Is there any reason you just didn’t continue posting to THIS thread?