I need to strip (and not keep) characters from the right of a list of irregular strings. For example, in this string;

SCR SC207 MC3001 4W FIRE SUPP & EXT INSP STAT Rev 0';

I need to strip 'Rev 0' and retain the rest.

Note that strings in the list may NOT be all the same length.

I can strip from the left, but the right is proving to be tricky.

Thanks
Jon