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Normalize a number list stored as a character string

normalize_num_list.Rd

normalize_num_list() standardizes strings that contain one or more integers.

Input is accepted only if it contains digits and optional authorized separators: spaces, ;, -, ,, and the word "ET" (case-insensitive, as a token). If any other character is present (e.g. letters like "ser", punctuation like "="), the function returns NA.

Cases:

  • NA -> NA.

  • A single integer (e.g. "15") -> unchanged.

  • A semicolon-separated list with no spaces (e.g. "15;101;100") -> unchanged.

  • Otherwise, integers are extracted and rejoined with sep. If no integer is found, returns NA.

Usage

normalize_num_list(x, sep = ";", unique = TRUE)

Arguments

x

A character vector.

sep

Separator used to join multiple integers after normalization. Default is ";".

unique

Logical. If TRUE, duplicated integers are removed while preserving first occurrence order. Default is TRUE.

Value

A character vector of the same length as x.

Examples

normalize_num_list(c(NA, "15", "15;101", "15 ET 101", "15-100-101", "ser"))
#> [1] NA           "15"         "15;101"     "15;101"     "15;100;101"
#> [6] NA