Matching an empty string with regex

Question

I\'ve seen posts here on stackoverflow that say that the regex ^$ will match an empty string... So it made me think... why not something like this: ^\\s+$

Answer 1

^\s+$ will match a sequence of one or more whitespaces, which is not an empty string at all.

An empty string does not contain any character, not even whitespace. However, if you use ^\s*$, it will match an empty string in addition to whitespaces.