Some questions:
Is it only upper case letters? Does it stop at Z? Is it a specific 5 character string that has four zeroes then an uppercase letter from J to Z at the end? Can there be more than one on a line? Can there be other information on either side? Is it one big line or are there multiple lines in a file? If J is -1 and K is -2, and T is -11, does the string become 000-11 or 00-11?