Extract substrings from before and inside parentheses

before_parens() and inside_parens() extract substrings from before or inside parentheses, or similar separators like brackets or curly braces.

See split_by_parens() to split some or all columns in a data frame into both parts.

Usage

before_parens(string, sep = "parens")

inside_parens(string, sep = "parens")

Arguments

string

Vector of strings with parentheses or similar.

sep

String. What to split by. Either "parens", "brackets", "braces", or a length-2 vector of custom separators. See examples for split_by_parens(). Default is "parens".

Value

String vector of the same length as string. The part of string

before or inside sep, respectively.

Examples

x <- c(
  "3.72 (0.95)",
  "5.86 (2.75)",
  "3.06 (6.48)"
)

before_parens(string = x)
#> [1] "3.72" "5.86" "3.06"

inside_parens(string = x)
#> [1] "0.95" "2.75" "6.48"