(r programming) How can I trim the start and end of a string in a dataframe in r, while preserving t-CodePudding

I have a dataframe from a chess game that contains the following data:

>View(game_summary_df)

   white_player      black_player           result       white_elo       black_elo
1 [White Gyc12] [Black SuperCarp] [Result 1/2-1/2] [WhiteElo 1355] [BlackElo 1243]

I would like to clean up the data by removing, for instance, "[White " and "]" from the white_player column, leaving only "Gyc12".

I am able to accomplish this using two separate str_replace commands:

> str_replace(game_summary_df[1,1], "\\[White ", "")
> str_replace(game_summary_df[1,1], "\\]", "")

Is there a way to combine this into one str_replace command? Something like the opposite of . ? to place in the middle is my thought.

CodePudding user response：

To do this cleanup in a single function call, you may use gsub() with an alternation. For example:

white_player <- "[White Gyc12]"
output <- gsub("^\\[\\w \\s |\\]$", "", white_player)
output

[1] "Gyc12"

CodePudding user response：

game_summary_df[1,1] %>% str_extract((?<=White ).*(?=\\]))