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I want to find the index of a character in a given string. Which R function should I use for it?

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You can use functions unlist() and gregexpr() to find the position of a character in a string. If the character appears more than once in the string, you will get all positions.

Here is an example:

> r = "helloarielprinter"
> unlist(gregexpr('p', r))
[1] 11
> unlist(gregexpr('e', r))
[1]  2  9 16

The first argument in the function gregexpr() is the character you are trying to search for, and the second argument is the string.