replace_to {textclean}

Grab Begin/End of String to/from Character

Description

replace_to - Grab from beginning of string to a character(s).

replace_from - Grab from character(s) to end of string.

Usage

replace_to(x, char = " ", n = 1, include = FALSE, ...)

replace_from(x, char = " ", n = 1, include = FALSE, ...)

Arguments

x

A character string

char

The character from which to grab until/from.

n

Number of times the character appears before the grab.

include

logical. If TRUE includes the character in the grab.

...

ignored.

Value

returns a vector of text with begin/end of string to/from character removed.

Author(s)

Josh O'Brien and Tyler Rinker <[e-mail]>.

References

http://stackoverflow.com/q/15909626/1000343

Examples

## Not run: 
x <- c("a_b_c_d", "1_2_3_4", "<_?_._:")
replace_to(x, "_")
replace_to(x, "_", 2)
replace_to(x, "_", 3)
replace_to(x, "_", 4)
replace_to(x, "_", 3, include=TRUE)

replace_from(x, "_")
replace_from(x, "_", 2)
replace_from(x, "_", 3)
replace_from(x, "_", 4)
replace_from(x, "_", 3, include=TRUE)

x2 <- gsub("_", " ", x)
replace_from(x2, " ", 2)
replace_to(x2, " ", 2)

x3 <- gsub("_", "\\^", x)
replace_from(x3, "^", 2)
replace_to(x3, "^", 2)

x4 <- c("_a_b", "a__b")
replace_from(x4, "_", 1)
replace_to(x4, "_", 1)

## End(Not run)