R：基于模式从整个数据帧中获取字符串

假设我有一个包含以下详细信息的数据框：

Name   Card1    Card2
A      A11234   A24321
B      B11234   B24321
C      C11234   C24321
D      D11234   D24321
E      E11234   E24321

我想根据字符形式的1234和4321模式从这个数据帧中提取字符串。假设我将字符串提取到一个名为all_cards的变量中，预期结果如下所示：

> all_cards
 [1] "A11234"           "A24321"            "B11234"          "B24321"        
 [5] "C11234"           "C24321"            "D11234"          "D24321"     
 [9] "E11234"           "E24321"        

> str(all_cards)
 chr [1:10] "A11234" "A24321" "B11234" "B24321" ...

请告知，提前谢谢

您可以取消数据帧列表并使用grep

您可以使用t来转置不包括名称列的数据帧，并同时将其强制为矩阵。最后将其强制为as.vector

资料

如上所述，所有的_卡和strall_卡都不匹配。为什么所有的_卡只有3个元素？这些是列表元素吗？strall_cards建议使用字符向量。

all_cards <- unname(grep('1234|4321', unlist(df), value = TRUE))

as.vector(t(dat[-1]))
# [1] "A11234" "A24321" "B11234" "B24321" "C11234" "C24321" "D11234" "D24321" "E11234"
# [10] "E24321"

dat <- structure(list(Name = c("A", "B", "C", "D", "E"), Card1 = c("A11234", 
"B11234", "C11234", "D11234", "E11234"), Card2 = c("A24321", 
"B24321", "C24321", "D24321", "E24321")), row.names = c(NA, -5L
), class = "data.frame")