I have several .txt files in a directory (filedir) which start with the following strings:

files= c('sasmin_somedata.txt','sasmax_somedata.txt','sas_somedata.txt')

s=c("sasmin","sasmax","sas")

I would like to use s to list the three files in files.

I tried the following code:

p <- glob2rx(paste0(s, filedir))

final <- list.files(filedir, p,full. Names=TRUE)

However,I keep getting duplicates of sasmin, sasmax because my current glob2rx implementation uses ‘sas’ as wildcard and cannot different ‘sas‘ from ‘sasmin‘ or ‘sasmax‘.