Using regex in R to find strings as whole words (but not strings as part of words)

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You need to add word boundary anchors (\b) around your search strings so only entire words will be matched (i. e. words surrounded by non-word characters or start/end of string, where “word character” means \w, i.e. alphanumeric character).

Try

grep("\\bTH\\b",t3, value=T)

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