Can I use REGEX to remove last character in a file

I have a file on the sap server which looks something like this:

0001#Text#gfdkgh#

0002#more#ljjpoir#

0003#then#ljddpoiw#

I want a program to remove the last hash character from each line.

I can read this file with OPEN DATASET etc, then REVERSE the line, and REPLACE FIRST CHAR with SPACE. This works fine but I wanted to find out if it could be done with REGEX as it might be more economical?

All help greatly appreciated. Thank you.