R: Subset / index an object by substring of the wanted entries

Question

Is it possible to extract/subset a dataframe by indicating only a chunk of the wanted entries-string?

The filter criteria is stored in an factor vector. But there are on

Answer 1

A regex approach:

subset(data, grepl(paste0("^",IDfilter,collapse="|"), ID))

        ID sex size
1  0120010   M    7
2  0120020   F    6
3  0121031   F    9
8  0150030   F   11
9  0150110   F   12
11 1150110   F   12

Note: "^" is to match the beginning of the string. I'm assuming there are only digits in your filters.