优雅的R功能:由句点分隔的混合表壳,以下划线分开的小写和/或驼色表壳

Question

我经常从协作者处获得数据集,这些数据集在数据集中具有不一致的变量/列命名.我的首要任务之一是重命名它们,我想在R内部完全解决这个问题.

as.Given <- c("ICUDays","SexCode","MAX_of_MLD","Age.Group")

underscore_lowercase <- c("icu_days", "sex_code", "max_of_mld","age_group")

camelCase <- c("icuDays", "sexCode", "maxOfMld", "ageGroup")

鉴于有关命名约定不同的意见,并本着什么Python中提出,有哪些途径,从去as.Given到underscore_lowercase和/或camelCase作为R用户指定的方式吗？

编辑: 还在R/regex中找到了这个相关的帖子,特别是@rengis的答案.

Answer 1

试试这个.这些至少可以用于给出的例子:

toUnderscore <- function(x) {
  x2 <- gsub("([A-Za-z])([A-Z])([a-z])", "\\1_\\2\\3", x)
  x3 <- gsub(".", "_", x2, fixed = TRUE)
  x4 <- gsub("([a-z])([A-Z])", "\\1_\\2", x3)
  x5 <- tolower(x4)
  x5
}

underscore2camel <- function(x) {
  gsub("_(.)", "\\U\\1", x, perl = TRUE)
}

#######################################################
# test
#######################################################

u <- toUnderscore(as.Given)
u
## [1] "icu_days"   "sex_code"   "max_of_mld" "age_group" 

underscore2camel(u)
## [1] "icuDays"  "sexCode"  "maxOfMld" "ageGroup"

Answer 2

要获得第二个underscore_lowercase( g ) 和camelCase( x ) 字符串，

> as.Given <- c("ICUDays","SexCode","MAX_of_MLD","Age.Group")
> r <- gsub("[^\\w]", "", as.Given, perl=T)
> f <- gsub("^.*?_.*$(*SKIP)(*F)|(?:[^A-Z]+|[A-Z_]+?)\\K([A-Z])(?=[A-Z_]+$|[a-z_]+$)", "_\\1", r,perl=T)
> g <- tolower(f)
> g
[1] "icu_days"   "sex_code"   "max_of_mld" "age_group"
> x <- gsub("_([a-z])", "\\U\\1", g,perl=T)
> x
[1] "icuDays"  "sexCode"  "maxOfMld" "ageGroup"

更新

> as.Given = c("CRMLevel1Code", "MAX_of_RhD", "MAX_Of_MCa", "MAX_of_NCCexclusion","ICUDays","SexCode","MAX_of_MLD","Age.Group","admitRom")
> r <- gsub("[^\\w]", "", as.Given, perl=T)
> f <- gsub("(?:[^A-Z]|^)[A-Z][A-Z][A-Z]\\K(?=[a-zA-Z])|(?=\\d)|^[A-Z][a-z]+\\K(?=[A-Z][a-z]+$)|(?<=\\d)(?=[A-Za-z])|^[a-z]+\\K(?=[A-Z][a-z]+$)", "_", r, perl=T)
> underscore_lowercase <- tolower(f)
> underscore_lowercase
[1] "crm_level_1_code"     "max_of_rhd"           "max_of_mca"          
[4] "max_of_ncc_exclusion" "icu_days"             "sex_code"            
[7] "max_of_mld"           "age_group"            "admit_rom"           
> camelCase <- gsub("_([a-z]|\d)", "\\U\\1", underscore_lowercase, perl=T)
Error: '\d' is an unrecognized escape in character string starting ""_([a-z]|\d"
> camelCase <- gsub("_([a-z]|\\d)", "\\U\\1", underscore_lowercase, perl=T)
> camelCase
[1] "crmLevel1Code"     "maxOfRhd"          "maxOfMca"         
[4] "maxOfNccExclusion" "icuDays"           "sexCode"          
[7] "maxOfMld"          "ageGroup"          "admitRom"