Narrow down files which names include date to specific months in r

June 7, 2022

I have thousands of .tif files which contain daily temperature data. The file names include the date in a format like this tminYYYYMMDD.tif, here is a sample:

tmin19810707.tif
tmin19810508.tif
tmin19810314.tif
tmin19810227.tif

I only need the data from June (06), July (07) and August (08) form all those years. How can I select and use for further processing only files that are from those months?

>Solution :

We can use substr for a base R solution:

x <- c("tmin19810707.tif", "tmin19810508.tif", "tmin19810314.tif",
       "tmin19810227.tif")
output <- x[substr(x, 9, 10) %in% c("06", "07", "08")]
output

[1] "tmin19810707.tif"