Dear list:



I have the following problem: From a vector like this:

vec<- c("mud_1999_area_A", "gravel_2004_area_F")



I would like to get the year in a separate vector, such



y<- c("1999", "2004")



I´ve been looking to grep() but I'm not sure how to do this.
Help?
Thanks in advance
J

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