在R中将字符串向量转换为数据框

Question

我正在开展一个快速抓取项目，其中涉及抓取历史 NFL 足球数据。下面是我的数据的快速浏览：

allgames_thisweek = c("Chicago Bears 21, Tampa Bay Buccaneers 9 -- Box Score", "Cleveland Browns 28, Cincinnati Bengals 20 -- Box Score", 
"Dallas Cowboys 26, Pittsburgh Steelers 9 -- Box Score", "Detroit Lions 31, Atlanta Falcons 28 (OT)  -- Box Score", 
"Green Bay Packers 16, Minnesota Vikings 10 -- Box Score", "Indianapolis Colts 45, Houston Oilers 21 -- Box Score", 
"Kansas City Chiefs 30, New Orleans Saints 17 -- Box Score", 
"Los Angeles Rams 14, Arizona Cardinals 12 -- Box Score", "Miami Dolphins 39, New England Patriots 35 -- Box Score", 
"New York Giants 28, Philadelphia Eagles 23 -- Box Score", "New York Jets 23, Buffalo Bills 3 -- Box Score", 
"San Diego Chargers 37, Denver Broncos 34 -- Box Score", "San Francisco 49ers 44, Los Angeles Raiders 14 -- Box Score", 
"Seattle Seahawks 28, Washington Redskins 7 -- Box Score")

allgames_thisweek[1]
"Chicago Bears 21, Tampa Bay Buccaneers 9 -- Box Score"

每一行有以下数据[team1, team1score, team2, team2score, --, Box Score]

我的数据格式都完全相同，这意味着第一队的得分后面总是有一个逗号，第二队的得分后面总是有一个--。我想创建一个包含 4 列（team1、team1score、team2、team2score）的数据框，因此输出可能如下所示：

output_df
            team1    team1score                  team2   team2score
1.  Chicago Bears            21  Tampba Bay Buccaneers            9

对我如何实现这一点有任何想法吗？任何帮助表示赞赏！谢谢

Answer 1

您可以使用dplyr + stringr 做到这一点：

library(dplyr)
library(stringr)

string %>%
  str_replace("(?<=\\d)\\s.*--.+$", "") %>%
  str_replace_all("\\s(?=\\d+\\b)", ",") %>%
  strsplit(",") %>%
  do.call(rbind, .) %>%
  data.frame() %>%
  setNames(c("team1", "team1score", "team2", "team2score"))

结果：

                 team1 team1score                 team2 team2score
1        Chicago Bears         21  Tampa Bay Buccaneers          9
2     Cleveland Browns         28    Cincinnati Bengals         20
3       Dallas Cowboys         26   Pittsburgh Steelers          9
4        Detroit Lions         31       Atlanta Falcons         28
5    Green Bay Packers         16     Minnesota Vikings         10
6   Indianapolis Colts         45        Houston Oilers         21
7   Kansas City Chiefs         30    New Orleans Saints         17
8     Los Angeles Rams         14     Arizona Cardinals         12
9       Miami Dolphins         39  New England Patriots         35
10     New York Giants         28   Philadelphia Eagles         23
11       New York Jets         23         Buffalo Bills          3
12  San Diego Chargers         37        Denver Broncos         34
13 San Francisco 49ers         44   Los Angeles Raiders         14
14    Seattle Seahawks         28   Washington Redskins          7

注意事项：

1. (?<=\\d)\\s.*--.+$ 匹配空格 (\\s) 后跟任意字符零次或多次 (.*)、文字 --、任意字符一次或多次 (.+)，并以字符串结尾 ($)。这个模式有一个额外的条件，它必须跟随一个数字(?<=\\d)。
2. (?<=...) 被称为正向后视，它检查 after 之后的内容是否紧跟 ... 中的模式。
3. \\s(?=\\d+\\b) 匹配紧跟在 ((?=...)) 数字一次或多次 和单词边界 (\\b) 之后的空格。所以这匹配了团队名称和团队分数之间的空格。
4. (?=...) 是一个正向前瞻，它检查 之前 中的内容是否立即遵循 ... 中的模式。

数据：

string = c("Chicago Bears 21, Tampa Bay Buccaneers 9 -- Box Score", "Cleveland Browns 28, Cincinnati Bengals 20 -- Box Score", 
       "Dallas Cowboys 26, Pittsburgh Steelers 9 -- Box Score", "Detroit Lions 31, Atlanta Falcons 28 (OT)  -- Box Score", 
       "Green Bay Packers 16, Minnesota Vikings 10 -- Box Score", "Indianapolis Colts 45, Houston Oilers 21 -- Box Score", 
       "Kansas City Chiefs 30, New Orleans Saints 17 -- Box Score", 
       "Los Angeles Rams 14, Arizona Cardinals 12 -- Box Score", "Miami Dolphins 39, New England Patriots 35 -- Box Score", 
       "New York Giants 28, Philadelphia Eagles 23 -- Box Score", "New York Jets 23, Buffalo Bills 3 -- Box Score", 
       "San Diego Chargers 37, Denver Broncos 34 -- Box Score", "San Francisco 49ers 44, Los Angeles Raiders 14 -- Box Score", 
       "Seattle Seahawks 28, Washington Redskins 7 -- Box Score")