R计算另一行字符串中行字符串值的出现次数

Question

在R中，查找一个函数来计算另一行值中一行值（完整字符串）的出现次数 例如：数据表df

df$SerachingFor  df$Target                               df$SearchTermOccurrencesInTarget (required field)
Machine rowing   machine rowing has two values           1
handy tools      handy tools, we have many handy tools   2
plans            home plans, garden plans, DIY plans     3
hospital         home ideas                              0

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Answer 1

以下是stringr库函数的一种方法。请注意，我将两列都转换为所有小写字母，因为您的示例意味着不区分大小写匹配。

library(stringr)
df$SerachingFor <- tolower(df$SerachingFor)
df$Target <- tolower(df$Target)
df$SearchTermOccurrencesInTarget <- str_count(df$Target, df$SerachingFor)
df
    SerachingFor                                Target SearchTermOccurrencesInTarget
1 machine rowing         machine rowing has two values                             1
2    handy tools  handy tools we have many handy tools                             2
3          plans     home plans garden plans DIY plans                             3
4       hospital                            home ideas                             0