如何根据具有正则表达式的复杂模式获取特定字符串答案

【问题标题】：How to get specific strings based on complex pattern with, regular expression如何根据具有正则表达式的复杂模式获取特定字符串
【发布时间】：2023-01-02 13:06:21
【问题描述】：

path<-c("C:/Users/SEYDOU GORO/Dropbox/PC (2)/Documents/BETCLIC/DONNEES/argentina-primera-division-matches-2022-to-2022-stats.csv",
"C:/Users/SEYDOU GORO/Dropbox/PC (2)/Documents/BETCLIC/DONNEES/argentina-primera-division-matches-2022-to-2022-stats.csv",
"C:/Users/SEYDOU GORO/Dropbox/PC (2)/Documents/BETCLIC/DONNEES/france-ligue-2-matches-2021-to-2022-stats.csv",
"C:/Users/SEYDOU GORO/Dropbox/PC (2)/Documents/BETCLIC/DONNEES/germany-2-bundesliga-matches-2021-to-2022-stats.csv")

mydata<-data.frame(path=path)

我想从变量 path 中创建新变量

Country模式是：DONNEES/country name -`

League 模式是：DONNEES/ a word - League name -matches

Year模式是：-The year-to

这应该是结果数据集：

                                                                                                                     path   Country           League Year
1 C:/Users/SEYDOU GORO/Dropbox/PC (2)/Documents/BETCLIC/DONNEES/argentina-primera-division-matches-2022-to-2022-stats.csv argentina primera-division 2022
2 C:/Users/SEYDOU GORO/Dropbox/PC (2)/Documents/BETCLIC/DONNEES/argentina-primera-division-matches-2022-to-2022-stats.csv argentina primera-division  202
3             C:/Users/SEYDOU GORO/Dropbox/PC (2)/Documents/BETCLIC/DONNEES/france-ligue-2-matches-2021-to-2022-stats.csv    france          ligue-2 2021
4       C:/Users/SEYDOU GORO/Dropbox/PC (2)/Documents/BETCLIC/DONNEES/germany-2-bundesliga-matches-2021-to-2022-stats.csv   germany     2-bundesliga 2021

【问题讨论】：

标签： r regex string design-patterns

【解决方案1】：

我们可以使用extract

library(tidyr)
extract(mydata, path, into = c("Country", "League", "Year"),
     ".*/(\w+)-(.*)-matches-(\d{4})-.*", remove = FALSE)

-输出

                                                                                                                     path   Country
1 C:/Users/SEYDOU GORO/Dropbox/PC (2)/Documents/BETCLIC/DONNEES/argentina-primera-division-matches-2022-to-2022-stats.csv argentina
2 C:/Users/SEYDOU GORO/Dropbox/PC (2)/Documents/BETCLIC/DONNEES/argentina-primera-division-matches-2022-to-2022-stats.csv argentina
3             C:/Users/SEYDOU GORO/Dropbox/PC (2)/Documents/BETCLIC/DONNEES/france-ligue-2-matches-2021-to-2022-stats.csv    france
4       C:/Users/SEYDOU GORO/Dropbox/PC (2)/Documents/BETCLIC/DONNEES/germany-2-bundesliga-matches-2021-to-2022-stats.csv   germany
            League Year
1 primera-division 2022
2 primera-division 2022
3          ligue-2 2021
4     2-bundesliga 2021

【讨论】：