I already offered the Biostrings package. It provides more robust methods for string matching than does grepl. Is there a reason that you choose not to?
Indeed that is the way I should go for and I have installed the package after some struggling. Since biostring is a fairly complex package and I need only a way to check if a certain string A is a subset of string B, do you know the biostring functions to achieve this? I see a lot of methods for biological (DNA, RNA) sequences, and they may not apply to my series (which are definitely not from biology).
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