Nothing
cpos <- function(str, sub, start = 1) {
lstr <- nchar(str)
lsub1 <- nchar(sub) - 1
if (start + lsub1 > lstr) return(NA)
else {
str <- substring(str, 1:(lstr - lsub1), (1 + lsub1):lstr)
p <- which(str == sub)[1]
if (is.na(p > 0)) return(NA)
else return(p)
}
}
cposV <- function(vstr, sub, vstart = 1) {
Len <- max(length(vstr), length(sub), length(vstart))
vstr <- matrix(c(rep(vstr, len = Len), rep(sub, len = Len),
rep(vstart, len = Len)), ncol = 3)
re <- sq <- 1:Len # generate vector with right length
for (ii in sq) {
re[ii] <- cpos(vstr[ii, 1], vstr[ii, 2], as.integer(vstr[ii, 3]))
} # ii
return(re)
} # cposV
cposR <- function(str, sub, restrict = c(1, nchar(str))) {
if(length(str) > 1) stop('only works with a single string str')
l.str <- nchar(str)
l.sub <- nchar(sub)
if(l.sub > l.str) return(list(first = 0, last = 0))
if(l.sub == l.str) return(if(str == sub) list(first = 1,
last = l.str) else list(first = 0, last = 0))
is <- 1:(l.str - l.sub + 1)
ss <- substring(str, is, is + l.sub - 1)
k <- ss == sub
if(!any(k)) return(list(first = NA, last = NA))
First <- k <- is[k]
Last <- k + l.sub - 1
irF <- inrange(First, restrict)
irL <- inrange(Last, restrict)
ir <- irF & irL
if(length(k) == 0 | !any(ir)) {list(first = NA, last = NA)
} else list(first = First[ir], last = Last[ir])
}
issubstr <- function(str, sub, start = 1) {
oldop <- options(warn = -1)
on.exit(options(oldop))
return(!is.na( cpos(str, sub, start)))
} # issubstr
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