![]() Note that here, non-capturing groups are used to match either start of string or, (see (?:^|,)) and either end of string or, (see ( (?:$|,))). The equivalent TRE regex will look like > grep("(?:^|,)XXX(?:$|,)",df$nms, value = FALSE) The first argument in the gsub function names the pattern we are looking for. You may use a PCRE regex (note the perl=TRUE argument) like (? grep("(? 2 3 Character Encoding GREP Tokenization Creating a Corpus Tidy-Text. It seems you want to only match a word in between commas or start/end of the string). There are base R commands and stringr package commands to achieve this (indicated with stringr:: below): Identify match to a pattern: grep(.
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