Extract words from a sentence.

Extract words from a sentence.

word(string, start = 1L, end = start, sep = fixed(" "))

Arguments

string	input character vector.
start	integer vector giving position of first word to extract. Defaults to first word. If negative, counts backwards from last character.
end	integer vector giving position of last word to extract. Defaults to first word. If negative, counts backwards from last character.
sep	separator between words. Defaults to single space.

Value

character vector of words from start to end (inclusive). Will be length of longest input argument.

Examples

sentences <- c("Jane saw a cat", "Jane sat down")
word(sentences, 1)
#> [1] "Jane" "Jane"
word(sentences, 2)
#> [1] "saw" "sat"
word(sentences, -1)
#> [1] "cat"  "down"
word(sentences, 2, -1)
#> [1] "saw a cat" "sat down" 

# Also vectorised over start and end
word(sentences[1], 1:3, -1)
#> [1] "Jane saw a cat" "saw a cat"      "a cat"         
word(sentences[1], 1, 1:4)
#> [1] "Jane"           "Jane saw"       "Jane saw a"     "Jane saw a cat"

# Can define words by other separators
str <- 'abc.def..123.4568.999'
word(str, 1, sep = fixed('..'))
#> [1] "abc.def"
word(str, 2, sep = fixed('..'))
#> [1] "123.4568.999"