Find Position of First Occurrence Of a String

Returns the numeric position of the first occurrence of a substring within a string. If the search string is not found, the result will be NA.

StrPos(x, pattern, pos = 1, ...)

Arguments

x: a character vector in which to search for the pattern, or an object which can be coerced by as.character to a character vector.
pattern: character string (search string) containing the pattern to be matched in the given character vector. This can be a character string or a regular expression.
pos: integer, defining the start position for the search within x. The result will then be relative to the begin of the truncated string. Will be recycled.
...: the dots are passed to the function regexpr.

This is just a wrapper for the function regexpr.

a vector of the first position of pattern in x

Andri Signorell <andri@signorell.net>

StrPos(x = levels(d.pizza$driver), pattern = "t")
#> [1]  3  7  4 NA  4 NA NA