Nothing
# Extract the pattern from membersurvey
oldptn <- pattern(membersurvey)
oldptn
# The pattern is used to extract columns
names(membersurvey)
grep("Q20", names(membersurvey), value=TRUE)
head(membersurvey["Q20"])
head(membersurvey["Q20_other"])
# Define a new pattern
pattern(membersurvey) <- list(sep="_", exclude="")
head(membersurvey["Q20"])
# Reset original pattern
pattern(membersurvey) <- oldptn
rm(oldptn)
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