string search from back to front?

[meino.cramer@...]

Hi,

in the PIL 2ed I didn't find a way to search from the end of a string
to the beginning. There is a way to specify an offset from the back 
with a negative instead of a positiv, but from that specified point
the search goes from 'left to right' or 'front to back'.
Is there real;y no equivalent to "RIGHTSTR()" in lua or did I overlook
something ?

Best regards,
mcc