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x <- c("abc", "abc/def","abc/de","abc/d","abc/def/i j k","abc/def/i","abc/def/i j")
sub("^(abc)(?:/[^/]*)?", "\\1/def", x)

Success #stdin #stdout 0.22s 60752KB

stdin

Standard input is empty

stdout

[1] "abc/def"       "abc/def"       "abc/def"       "abc/def"      
[5] "abc/def/i j k" "abc/def/i"     "abc/def/i j"

https://ideone.com/5pRyNr

language:

R (R 3.5.2)

created:

visibility:

secret

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