Is there is simple way in QUIZ to find the position of the last e mbedded space in a character string?

[George_DeWolf@midhosp.org]

For example, if I have the following string where [sp] indicates a space

"ABC[sp]D[sp][sp]E"

I would like a value of 7 to be returned.  I'm using version 8.19.C5 of Quiz
on the HP3000.