Last updated: 2024-11-25
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| Rmd | f6c88d1 | Chun-Hui Lin | 2024-11-25 | Add stringr-related files. |
Some notes on data wrangling for strings from the stringr site using fruit
dataset as the example.
str_sub(): extract substring by specified positionstr_sub("catdog", start = 1, end = 3) # count from the left[1] "cat"str_sub("catdog", start = -3, end = -1) # count from the right[1] "dog"str_c(): join strings into one.str_c(c("cat", "dog"), collapse = ", ") # equivalent to paste()[1] "cat, dog"str_detect(): detect specified pattern.str_detect(c("cat", "dog"), "[abc]") # match any single character that is a, b, or c[1] TRUE FALSEstr_split(): split string by specified symbol.str_split("cat dog", " ")[[1]]
[1] "cat" "dog"str_subset(): find elements with matching pattern.str_subset(fruit, " ") # find two-word fruits [1] "bell pepper" "blood orange" "canary melon"
[4] "chili pepper" "goji berry" "kiwi fruit"
[7] "purple mangosteen" "rock melon" "salal berry"
[10] "star fruit" "ugli fruit" str_subset(fruit, "^a") # find fruits starting with "a"[1] "apple" "apricot" "avocado"str_subset(fruit, "a$") # find fruits ending with "a"[1] "banana" "cherimoya" "feijoa" "guava" "papaya" "satsuma" str_subset(fruit, "^[aeiou]") # find fruits with starting with a vowel[1] "apple" "apricot" "avocado" "eggplant" "elderberry"
[6] "olive" "orange" "ugli fruit"str_subset(fruit, "[aeiou]{2}") # find fruits with two consecutive vowels [1] "blood orange" "blueberry" "breadfruit"
[4] "cantaloupe" "cloudberry" "dragonfruit"
[7] "durian" "feijoa" "gooseberry"
[10] "grapefruit" "guava" "jackfruit"
[13] "kiwi fruit" "kumquat" "loquat"
[16] "lychee" "passionfruit" "peach"
[19] "pear" "pineapple" "purple mangosteen"
[22] "quince" "raisin" "star fruit"
[25] "ugli fruit" # find fruits ending with two consecutive consonants other than r
str_subset(fruit, "[^aeiour]{2}$")[1] "blackcurrant" "currant" "eggplant" "peach" "redcurrant" # find fruits with two consecutive vowels twice, separated by one or more consants
str_subset(fruit, "[aeiou]{2}.+[aeiou]{2}")[1] "breadfruit" "feijoa" "passionfruit"# find fruits with extactly three consectutive consonants in the middle of two vowels
str_subset(fruit, "[aeiou][^aeiou ]{3}[aeiou]") [1] "apple" "blackberry" "blackcurrant"
[4] "breadfruit" "dragonfruit" "huckleberry"
[7] "passionfruit" "pineapple" "purple mangosteen"
[10] "raspberry" ## find fruits with a repeated letter
str_subset(fruit, "(.)\\1") [1] "apple" "bell pepper" "bilberry"
[4] "blackberry" "blackcurrant" "blood orange"
[7] "blueberry" "boysenberry" "cherry"
[10] "chili pepper" "cloudberry" "cranberry"
[13] "currant" "eggplant" "elderberry"
[16] "goji berry" "gooseberry" "huckleberry"
[19] "lychee" "mulberry" "passionfruit"
[22] "persimmon" "pineapple" "purple mangosteen"
[25] "raspberry" "redcurrant" "salal berry"
[28] "strawberry" "tamarillo"
sessionInfo()R version 4.4.0 (2024-04-24)
Platform: aarch64-apple-darwin20
Running under: macOS 15.1.1
Matrix products: default
BLAS: /Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/lib/libRblas.0.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/lib/libRlapack.dylib; LAPACK version 3.12.0
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
time zone: America/Detroit
tzcode source: internal
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] lubridate_1.9.3 forcats_1.0.0 dplyr_1.1.4 purrr_1.0.2
[5] readr_2.1.5 tidyr_1.3.1 tibble_3.2.1 ggplot2_3.5.1
[9] tidyverse_2.0.0 stringr_1.5.1 workflowr_1.7.1
loaded via a namespace (and not attached):
[1] sass_0.4.9 utf8_1.2.4 generics_0.1.3 stringi_1.8.4
[5] hms_1.1.3 digest_0.6.37 magrittr_2.0.3 timechange_0.3.0
[9] evaluate_1.0.0 grid_4.4.0 fastmap_1.2.0 rprojroot_2.0.4
[13] jsonlite_1.8.9 processx_3.8.4 whisker_0.4.1 ps_1.7.6
[17] promises_1.3.0 httr_1.4.7 fansi_1.0.6 scales_1.3.0
[21] jquerylib_0.1.4 cli_3.6.3 rlang_1.1.4 munsell_0.5.1
[25] withr_3.0.1 cachem_1.1.0 yaml_2.3.10 tools_4.4.0
[29] tzdb_0.4.0 colorspace_2.1-1 httpuv_1.6.15 vctrs_0.6.5
[33] R6_2.5.1 lifecycle_1.0.4 git2r_0.33.0 fs_1.6.4
[37] pkgconfig_2.0.3 callr_3.7.6 pillar_1.9.0 bslib_0.8.0
[41] later_1.3.2 gtable_0.3.5 glue_1.7.0 Rcpp_1.0.13
[45] xfun_0.47 tidyselect_1.2.1 rstudioapi_0.16.0 knitr_1.48
[49] htmltools_0.5.8.1 rmarkdown_2.28 compiler_4.4.0 getPass_0.2-4