R: Grab Begin/End of String to/from Character

replace_to {textclean} | R Documentation

## 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 <tyler.rinker@gmail.com>.

### 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)

[Package textclean version 0.9.3 Index]