regex - Regular expression for condition until next space -

how write regular expression grabs capital letter located anywhere subsequent character until space?

input: cake pietypeapple crumble tart toasttexas price

for example, want grab "apple" despite not being preceded space. want "crumble". want "texas" though not of components upper case.

i use gsub(pattern, replacement = "", x = string) following output

output: cake pietype tart toast price

thanks!

you can use regmatches extract these substrings.

> x <- 'cake pietypeapple crumble tart toasttexas price' > regmatches(x, gregexpr('[a-z]\\s+', x))[[1]] # [1] "apple"   "crumble" "texas"

alternatively, if want strict on matching letter characters only.

> regmatches(x, gregexpr('[a-z][a-za-z]+', x))[[1]]

if want replace them, use following avoid excess space left in between words.

> gsub('[a-z][a-za-z]+( [a-z][a-za-z]+)*', '', x) # [1] "cake pietype tart toast price"

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