R数据帧字符串包含：列1是否包含列2？ [英] R data frame string contains: Does column 1 contain column 2?

问题描述

我有一个包含两列的数据框：

I have a dataframe with two columns:

  Surname                Email
1   house  [e-mail]
2  wilson [e-mail]

我想创建一个逻辑向量，检查是否姓氏包含在电子邮件中。因此，结果应该是：

I want to create a logical vector which checks if Surname is contained in Email. The result should therefore be:

  Surname                Email CheckEmail
1   house  [e-mail]       TRUE
2  wilson [e-mail]      FALSE

我尝试过 grep 但似乎 grep 只能在1个或多个实例中查找一个模式。 我特别需要在多个实例中查找多个模式。

I tried grep but it seems that grep can only look for one pattern in 1 or more instances. I specifically need to look for multiple patterns in multiple instances.

> grep(df1$Surname,df1$Email)
[1] 1
Warning message:
In grep(df1$Surname, df1$Email) :
  argument 'pattern' has length > 1 and only the first element will be used

推荐答案

library（stringi）和：

df1$CheckEmail <- stri_detect_fixed(df1$Email, df1$Surname)

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