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regcapturedmatches.R: extracts captured matches from match data obtained by regexpr, gregexpr or regexec
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regcapturedmatches<-function(x,m) { | |
if (length(x) != length(m)) | |
stop(gettextf("%s and %s must have the same length", | |
sQuote("x"), sQuote("m")), domain = NA) | |
ili <- is.list(m) | |
useBytes <- if (ili) { | |
any(unlist(lapply(m, attr, "useBytes"))) | |
} else { | |
any(attr(m, "useBytes")) | |
} | |
if (useBytes) { | |
asc <- iconv(x, "latin1", "ASCII") | |
ind <- is.na(asc) | (asc != x) | |
if (any(ind)) | |
Encoding(x[ind]) <- "bytes" | |
} | |
if (ili) { | |
if (any(sapply(m, function(x) {is.null(attr(x,"capture.start"))})==T)) { | |
stop("No capture data found (did you use perl=T?)") | |
} | |
starts<-lapply(m, function(x) {attr(x, "capture.start")}) | |
lengths<-lapply(m, function(x) {attr(x, "capture.length")}) | |
} else { | |
if (is.null(attr(m,"capture.start"))) { | |
stop("No capture data found (did you use perl=T?)") | |
} | |
x<-list(x) | |
starts<-list(attr(m, "capture.start")) | |
lengths<-list(attr(m, "capture.length")) | |
} | |
cleannames <- function(x) { | |
if (!is.null(colnames(x))) { | |
colnames(x) <- make.unique(make.names(colnames(x))) | |
} | |
x | |
} | |
starts <- lapply(starts, cleannames) | |
lengths <- lapply(lengths, cleannames) | |
Substring<-function(x,starts,lens) { | |
if(all(starts<0)) { | |
return(character()) | |
} else { | |
x <- t( | |
mapply(function(x,st,ln) substring(x,st,st+ln-1), | |
x, data.frame(t(starts)), data.frame(t(lens)), | |
USE.NAMES=F) | |
) | |
if (!is.null(colnames(starts))) { | |
colnames(x)<-colnames(starts) | |
} | |
x | |
} | |
} | |
y<-Map( | |
function(x, sos, mls) { | |
Substring(x,sos,mls) | |
}, | |
x, | |
starts, | |
lengths, | |
USE.NAMES = FALSE | |
) | |
if (ili) { | |
y | |
} else { | |
y[[1]] | |
} | |
} |
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x<-c("larry:35,M","alison:22,F","dave","lily:55,F") | |
m<-regexpr("(.*):(\\d+),([MF])", x, perl=T) | |
regcapturedmatches(x,m) | |
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