R 正则表达式过滤器的匿名函数
我有一个R 正则表达式过滤器的匿名函数,r,dplyr,purrr,R,Dplyr,Purrr,我有一个filter()函数,用于在TIBLE中过滤特定的正则表达式。因为我不止一次需要这样做,所以我想编写一个as\u mapper()函数,以得到更短的代码。我该怎么做 我尝试了以下方法: adverts <- as_mapper(~!grepl("(xtm)|((k|K)(i|I|1|11)(d|D)(n|N).)|(Ar<e)\\s(you)\\s(in)| (LOAN)|(AR(\\s|\\S)[0-9])|((B|b)(i|1|l)tc.)|(Coupon)|(Pl
filter()
函数,用于在TIBLE中过滤特定的正则表达式。因为我不止一次需要这样做,所以我想编写一个as\u mapper()
函数,以得到更短的代码。我该怎么做
我尝试了以下方法:
adverts <- as_mapper(~!grepl("(xtm)|((k|K)(i|I|1|11)(d|D)(n|N).)|(Ar<e)\\s(you)\\s(in)|
(LOAN)|(AR(\\s|\\S)[0-9])|((B|b)(i|1|l)tc.)|(Coupon)|(Plastic.King)|(organs)|(SILI)|(Electric.Cigarette.Machine)",.$value,perl = T)%>% filter)
编辑较短的代码
您可以编写一个简单的单行函数,它不依赖于作为映射器
:
target_regex <- "(xtm)|((k|K)(i|I|1|11)(d|D)(n|N).)|(Ar<e)\\s(you)\\s(in)|
(LOAN)|(AR(\\s|\\S)[0-9])|((B|b)(i|1|l)tc.)|(Coupon)|(Plastic.King)|(organs)|(SILI)|(Electric.Cigarette.Machine)"
adverts <- function(df, col) df[!grepl(target_regex, df[[col]],perl = T), ]
test_df %>% adverts(col = "value")
这也是我提出的一个想法,但可能不是最方便的解决方案,我想使用一个匿名函数来避免这10-15行代码,但只需使用一个简单的
as\u mapper()
函数即可。在这种情况下,您仍然不需要as\u mapper
,只需使用一个匿名函数即可。我已经编辑了我的答案来展示一个例子
target_regex <- "(xtm)|((k|K)(i|I|1|11)(d|D)(n|N).)|(Ar<e)\\s(you)\\s(in)|
(LOAN)|(AR(\\s|\\S)[0-9])|((B|b)(i|1|l)tc.)|(Coupon)|(Plastic.King)|(organs)|(SILI)|(Electric.Cigarette.Machine)"
adverts <- function(df, col) df[!grepl(target_regex, df[[col]],perl = T), ]
test_df %>% adverts(col = "value")
filter_regex <- function(df, regex, col){
df %>%
mutate(found = grepl(pattern = regex, x = df[[col]])) %>%
filter(found == TRUE) %>%
select(-found)
}
test_df <- map(all.nodes, ~ html_nodes(bribe, .x) %>% html_text()) %>%
unlist %>%
as_tibble
target_regex <- "(xtm)|((k|K)(i|I|1|11)(d|D)(n|N).)|(Ar<e)\\s(you)\\s(in)|
(LOAN)|(AR(\\s|\\S)[0-9])|((B|b)(i|1|l)tc.)|(Coupon)|(Plastic.King)|(organs)|(SILI)|(Electric.Cigarette.Machine)"
filter_regex(test_df, target_regex, "value")
> # A tibble: 7 x 1
> value
> <chr>
> 1 "\r\n Kidney Donor Needed Urgently Needed\r\n "
> 2 "\r\n Kidney Donor Needed Urgetly \r\n "
> 3 "\r\n Urgent Kidney Donor Needed\r\n "
> 4 "\r\n Urgent Kidney Donor Needed\r\n "
> 5 "\r\n Kidney Donor Needed\r\n "
> 6 "\r\n Kidney Donor Needed\r\n "
> 7 "\r\n Kidney donation urgently needed in India for 7 CR\r\n