That’s a part of my data:

structure(list(Testa = c(-1L, -1L, -1L, 
                                              -1L, -1L, -1L, -1L, -1L), Pre = c(NaN, NaN, NaN, 
                                                                                                NaN, NaN, NaN, NaN, NaN), Fract = c(NaN, NaN, 
                                                                                                                                                      NaN, NaN, NaN, NaN, NaN, NaN), Terms = c(-1L, 
                                                                                                                                                                                                               -1L, -1L, -1L, -1L, -1L, -1L, -1L), Time = c(NaN, 
                                                                                                                                                                                                                                                                                  NaN, NaN, NaN, NaN, NaN, NaN, NaN), Matches = c("y15", "b6", "b7", 
                                                                                                                                                                                                                                                                                                                                  "b11", "y9", "b8(2+)", "y10(3+)", "b12(5+)")), row.names = c(NA, 
                                                                                                                                                                                                                                                                                                                                                                                              -8L), class = c("tbl_df", "tbl", "data.frame"))

Let’s focus on column Matches. I would like to divide it to three columns Matches2, etc.. and fill up with the scheme like below – desired output:

Take a first character (letter: y or b) to first column, in second column should be a next character – number after the letter and in last column should be a number from bracket () without + and the one which do not have a bracket at all should be filled with number 1.