trimws
nchar
nzchar
paste
paste0
grepl
grep
gsub
sub
toupper
tolower
startsWith
endsWith
strsplit
substr
chartr
formatC
which
which_min
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diff
cumsum
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rev
duplicated
setdiff
intersect
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unique
seq_along
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seq
r_range
sign
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table
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lapply
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Filter
Map
Reduce
head
tail
length
nrow
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dim
summary
rstr
vec
trimws(x, which='both', whitespace='[ \\t\\r\\n]')
Strip whitespace from strings. which: ‘both’, ‘left’, ‘right’. Vectorised.