Regex to extract the string after a number in R

Question

I want to extract the string after a number using RegEx in R. For example in this vector:

ex <- c("1112 - 6839 COLBORNE ST", "11 - 5552 FRONTENACK ST", "1430 WINDFIELD CRES LINE", "111 - 55502 FRONT ST SOUTH WEST")

The expected outcome should be:

COLBORNE, FRONTENACK, WINDFIELD, FRONT

I know that in Python this can be implemented through capturing groups but I was not able to do it in R or maybe there is an easier way to do it.