编写正则表达式以将文本列中的特定名称替换为另一个名称

Question

我有一个数据集，其中包含如下一些文本：

df <- data.frame(
  name=c('Chris is nice','ris is nice and ris is old','Risoto is bad','RIS is bad',
         'rising is nice ', 'Prosis is ris and big','Ris is tall','doris is short'))

df %>% select(name)

                        name
1              Chris is nice
2 ris is nice and ric is old
3              Risoto is bad
4                 RIS is bad
5            rising is nice 
6      Prosis is ris and big
7                Ris is tall
8             doris is short

我只需要替换之前或之后没有字符串并显示为ris的ris名称。 此类词需要替换为LTD 。

感兴趣的结果将是：

                        name
1              Chris is nice
2 LTD is nice and LTD is old
3              Risoto is bad
4                 LTD is bad
5            rising is nice 
6      Prosis is LTD and big
7                LTD is tall
8             doris is short

谢谢！

Answer 1

我建议mutate(name = gsub("\\<ris\\>", "LTD", name, ignore.case = TRUE))

library(dplyr)
  
df <- data.frame(
  name=c('Chris is nice','ris is nice and ris is old','Risoto is bad','RIS is bad',
         'rising is nice ', 'Prosis is ris and big','Ris is tall','doris is short'))

df %>% 
  mutate(name = gsub("\\<ris\\>", "LTD", name, ignore.case = TRUE)) %>% 
  select(name)

                        name
1              Chris is nice
2 LTD is nice and LTD is old
3              Risoto is bad
4                 LTD is bad
5            rising is nice 
6      Prosis is LTD and big
7                LTD is tall
8             doris is short