halveString {eatTools}

Split string exactly in two parts

Description

strsplit splits a string according to a specific regular expression. The number of occurrences of the splitting regular expression defines the number of splits. halveString allows to split the string in only two parts, no matter how often the splitting regular expression occurs.

Usage

halveString (string, pattern, first = TRUE , colnames=c("X1", "X2"))

Arguments

string

A character vector.

pattern

character vector (or object which can be coerced to such) to use for splitting.

first

Logical: Relevant if the pattern occurs more than one time in the string. Defines whether the first (default) or last occurrence is used for splitting.

colnames

Optional: character vector of length 2 to specify the colnames of the resulting data.frame.

Value

A matrix with two columns

Examples

str1 <- c("John_Bolton", "Richard_Milhouse_Nixon", "Madonna")
strsplit(str1, split = "_")
halveString(str1, pattern = "_")
halveString(str1, pattern = "_", first=FALSE)

# split patterns with more than one character and regular expression
str2 <- c("John._.Bolton", "Richard._.Milhouse._.Nixon", "Madonna")
halveString(str2, pattern = encodeString("._."), first=FALSE)