How to specify to grepl to take into account a vowel irrespective of the accent

I am working on data where the words are in French.
I want grepl to take into account the word, whether the vowel has an accent or not.
Here is a part of code:

Here I want grepl to spot all word that are radiothérapie or radiotherapie, that is to ignore the accent


>Solution :

ifelse(grepl("Radioth[eé]rapie", c("Radiotherapie", "Radiothérapie", "Radio")),"yes","no")

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