I want to repeat certain part of string between ] and ; as the number of elements separated by ; preceding within []. So the desired output for [A1, AB11; A2, AB22] I1, C1 would be [A1, AB11] I1, C1; [A2, AB22] I1, C1. Any hints to start with. Thanks
df1 <-
data.frame(
String = c(
"[A1, AB11; A2, AB22] I1, C1; [A3, AB33] I3, C1"
, "[A4, AB44] I4, C4; [A5, AB55; A6, AB66; A7, AB77] I7, C7"
)
)
df1
String
1 [A1, AB11; A2, AB22] I1, C1; [A3, AB33] I3, C1
2 [A4, AB44] I4, C4; [A5, AB55; A6, AB66; A7, AB77] I7, C7
df2 <-
data.frame(
String = c(
"[A1, AB11] I1, C1; [A2, AB22] I1, C1; [A3, AB33] I3, C1"
, "[A4, AB44] I4, C4; [A5, AB55] I7, C7;[A6, AB66] I7, C7; [A7, AB77] I7, C7"
)
)
df2
String
1 [A1, AB11] I1, C1; [A2, AB22] I1, C1; [A3, AB33] I3, C1
2 [A4, AB44] I4, C4; [A5, AB55] I7, C7;[A6, AB66] I7, C7; [A7, AB77] I7, C7
Not the tidiest solution however it's using stringr
str_split(df1$String, ";(?= *\\[)") %>%
map(str_match, "\\[(.+?)\\] (.+)") %>%
map( ~ paste(unlist(map2(paste0(str_split(.x[,2], "; ?")), .x[,3], ~ paste0("[", .x,"] ",.y ))), collapse="; "))
somewhat nicer solution:
as_tibble(df1) %>%
mutate(splits=str_split(String, "; *(?=\\[)")) %>%
unnest_longer(col=splits) %>%
mutate(splits=map(str_split(splits,"\\[|\\] ?"), str_split, "; ?")) %>%
unnest_wider(splits) %>%
mutate(val=map2(...2, ...3, ~ paste0("[", .x ,"] ", .y, collapse="; ") )) %>%
group_by(String) %>%
summarise(val=paste0(val, collapse="; "))
# A tibble: 2 x 2
String val
<fct> <chr>
1 [A1, AB11; A2, AB22] I1, C1; [A3,… [A1, AB11] I1, C1; [A2, AB22] I1, C1; [A3, AB33] I3, C1
2 [A4, AB44] I4, C4; [A5, AB55; A6,… [A4, AB44] I4, C4; [A5, AB55] I7, C7; [A6, AB66] I7, C7; [A7, AB77] I7, C7