- Regex review time:
^means the beginning of a string.
- In string,
\will escape the next special chars. So if you want to write
\w, you need to write
sentence is a list of
words that are separated by a
single space with
no leading or trailing spaces. Each of the words consists of only uppercase and lowercase English letters (no punctuation).
- For example,
"hello world hello world"are all sentences.
You are given a sentence
s and an integer
k. You want to truncate
s such that it contains only the first
k words. Return
s after truncating it.
Input: s = "Hello how are you Contestant", k = 4