find the first occurrence of a character in a string in R

  # Function to find the first occurrence of a character in a string
  find_char <- function(string, char) {
      # Find the position of first occurrence of given character in the string
      start = regexpr(char, string)
      # Return the positions of the first occurrence
      return(start)
  }

This code creates a function called ‘find_char’ which takes two arguments - a string and a character. The purpose of the function is to find the positions of the first occurrence of the given character in the string.

The function first uses the ‘regexpr’ function to find the positions of the character in the string and stores them in ‘start’. Finally, the positions are returned by the function using the ‘return’ function.

For example, if you give the string ‘hello world’ and the character ‘w’ as arguments to the ‘find_char’ function, the output will be 8 since the first occurrence of ‘w’ is at the 8th position in the string.