使用来自另一个数据框的相同字符串匹配一个字符串

Question

我有这个数据框 (DF1)

structure(list(ID = 1:3, Text = c("there was not clostridium", "clostridium difficile positive", "test was OK")), class = "data.frame", row.names = c(NA, -3L)) 

ID TEXT
1  "there was not clostridium"
2  "clostridium difficile positive"
3  "test was OK"

和数据框 (DF2)

structure(list(ID = 1:3, Microorganisms = c("ESCHERICHIA COLI", "CLOSTRIDIUM DIFFICILE", "FUNGI")), class = "data.frame", row.names = c(NA, -3L))

ID Microorganisms
1  ESCHERICHIA COLI
2  CLOSTRIDIUM DIFFICILE
3  FUNGI

我想用正则表达式找到匹配的 DF1 和 DF2 并将它们放入这样的新列中

ID TEXT                                Microorganism
1  "there was not clostridium"         CLOSTRIDIUM DIFFICILE
2  "clostridium difficile positive"    CLOSTRIDIUM DIFFICILE
3  "test was OK"                       no

我试过这样的东西

DF1 %>% mutate(Mikroorganism = ifelse(grepl(DF2$Microorganisms, TEXT), str_extract(TEXT, DF2$Microorganisms), "no"))

但事实并非如此。

Answer 1

一种方法是使用 fuzzyjoin 包。

DF1 %>%
  fuzzyjoin::regex_left_join(
    transmute(DF2, Microorganisms, ptn = gsub("\s+", "|", Microorganisms)),
    by = c("Text" = "ptn"), ignore_case = TRUE) %>%
  select(-ptn)
#   ID                           Text        Microorganisms
# 1  1      there was not clostridium CLOSTRIDIUM DIFFICILE
# 2  2 clostridium difficile positive CLOSTRIDIUM DIFFICILE
# 3  3                    test was OK                  <NA>

使用来自另一个数据框的相同字符串匹配一个字符串

Mach a string with the same string from another data frame

r

matching

string-matching