using strrpos to find numeric charater in string

[fuston05]

I need to use find the last occurrence of a varying # in a string. strrpos wants me to specify a #. I cant because the number is a sequence. so i need the last sequence #, so is there way to make it find last numeric char used instead if specific #, or is there a better function than strrpos all together i should look at? thanks in advance for all your help.