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utils-rematch2.R
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utils-rematch2.R
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# inlined from
# https://github.com/r-lib/rematch2/commit/aab858e3411810fa107d20db6f936c6b10cbdf3f
# EXCEPT I don't return a tibble
re_match <- function(text, pattern, perl = TRUE, ...) {
stopifnot(is.character(pattern), length(pattern) == 1, !is.na(pattern))
text <- as.character(text)
match <- regexpr(pattern, text, perl = perl, ...)
start <- as.vector(match)
length <- attr(match, "match.length")
end <- start + length - 1L
matchstr <- substring(text, start, end)
matchstr[ start == -1 ] <- NA_character_
res <- data.frame(
stringsAsFactors = FALSE,
.text = text,
.match = matchstr
)
if (!is.null(attr(match, "capture.start"))) {
gstart <- attr(match, "capture.start")
glength <- attr(match, "capture.length")
gend <- gstart + glength - 1L
groupstr <- substring(text, gstart, gend)
groupstr[ gstart == -1 ] <- NA_character_
dim(groupstr) <- dim(gstart)
res <- cbind(groupstr, res, stringsAsFactors = FALSE)
}
names(res) <- c(attr(match, "capture.names"), ".text", ".match")
#class(res) <- c("tbl_df", "tbl", class(res))
res
}