# Leetcode 1816 - Truncate sentence

Note:

• 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 \\w.
• \s means space.
• \w means letter.

Question:

A 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", and "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.

Example:

Code: