I just ran that data line ( c:/loc1/loc2/loc3/84xxxxxB01_e1_1) through the above code and got 84xxxxxB01_e1_bot as expected, so I'm not sure why it didn't work for you. 

while (<DATA>) {
  /\/([^\/]+)\d$/;
  print $1."bot\n";
}

__DATA__
c:/loc1/loc2/loc3/84xxxxxB01_e1_1

[download]

--- Jay

All code is untested unless otherwise stated.
All opinions expressed are my own and are intended as guidance, not gospel; please treat what I say as such and as Abigail said Think for yourself.
If in doubt ask.

In reply to Re^3: extracting data from a line by gothic_mallard
in thread extracting data from a line by RCP

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