grepRaw searches for substring pattern matches within a
raw vector x.grepRaw(pattern, x, offset = 1L, ignore.case = FALSE,
value = FALSE, fixed = FALSE, all = FALSE, invert = FALSE)fixed = TRUE) to be matched in the
given raw vector. Coerced by charToRaw to a character
string if possible.charToRaw to a raw vector. Long vectors
are not supported.FALSE, the pattern matching is case
sensitive and if TRUE, case is ignored during matching."^" will match there.TRUE, pattern is a pattern to be
matched as is.TRUE all matches are returned,
otherwise just the first one.TRUE return indices or values for
elements that do not match. Ignored (with a warning) unless
value = TRUE.grepRaw(value = FALSE) returns an integer vector of the offsets
at which matches have occurred. If all = FALSE then it will be
either of length zero (no match) or length one (first matching
position). grepRaw(value = TRUE, all = FALSE) returns a raw vector which
is either empty (no match) or the matched part of x. grepRaw(value = TRUE, all = TRUE) returns a (potentially
empty) list of raw vectors corresponding to the matched parts.grep, seeks matching patterns within the raw
vector x . This has implications especially in the all =
TRUE case, e.g., patterns matching empty strings are inherently
infinite and thus may lead to unexpected results. The argument invert is interpreted as asking to return the
complement of the match, which is only meaningful for value =
TRUE. Argument offset determines the start of the search, not
of the complement. Note that invert = TRUE with all =
TRUE will split x into pieces delimited by the pattern
including leading and trailing empty strings (consequently the use of
regular expressions with "^" or "$" in that case may
lead to less intuitive results). Some combinations of arguments such as fixed = TRUE with
value = TRUE are supported but are less meaningful.regexp) for the details
of the pattern specification. grep for matching character vectors.