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  1. library(stringr)
  2. x <- c("saɪəns", "ɪvɒlvd", "ˌʌndəstænd", "skɑːb(ə)rə", "pəteɪtəʊ", "dɪskraɪbdɪ")
  3. sapply(str_extract_all(x, "(.)(?=.*\\1)"), function(z) paste(unique(z), collapse=""))
  4.  
Success #stdin #stdout 0.22s 42236KB
comments (?)
stdin 
Standard input is empty
stdout 
[1] "s"  "v"  "nd" "ə"  "ət" "dɪ"
https://ideone.com/bDJ2FF
language:
R (R 3.5.2)
created:
5 years ago
visibility:
secret

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