R: Regex madness (stringi) -


i have vector of strings this:

g30(h).g3(m).g0(l).replicate(1)

iterating on c("h", "m", "l"), extract g30 (for "h"), g3 (for "m") , g0 (for "l").

my various attempts have me confused - regex101.com debugger, e.g. indicates (\w*)\(m\) works fine, transferring r fails ...

using stringi package , outer() function:

library(stringi)  strings <- c(   "g30(h).g3(m).g0(l).replicate(1)",   "g5(m).g11(l).g6(h).replicate(9)",   "g10(m).g6(h).g8(m).replicate(200)"  # no "l", repeated "m" ) targets  <- c("h", "m", "l") patterns <- paste0("\\w+(?=\\(", targets, "\\))") matches  <- outer(strings, patterns, fun = stri_extract_first_regex) colnames(matches) <- targets matches #      h     m    l     # [1,] "g30" "g3" "g0"  # [2,] "g6"  "g5" "g11" # [3,] "g6"  "g10" na

this ignores instances of target letter past first, gives na when target's not found, , returns in simple matrix. regular expressions stored in patterns match substrings xx(y), y target letter , xx number of word characters.


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