What is meaning of this ?

what is the meaning of this regex ^[A-Z]*$ ?
i guess it does not allow a char between A-Z at the starting. but whats next ?

what is the meaning of this regex ^[A-Z]*$ ?
i guess it does not allow a char between A-Z at the
starting. but whats next ?Nope, you are way off.
Here is a break down:
^(carat)
This matches the beginning of the input.
[A-Z]
The brackets create a character class, and the contents describe the class.
This class represents any upperclass letter from A to Z
When this follows a character, a group, or a character class this symbol means
'zero or more of the previous'. So, combined with the [A-Z] character class, it means
zero or more uppercase letters from A to Z
$
This matches the end of the input.
So, to put this all together, your expression will match any string that is
either empty or only contains upper case letters from A to Z.

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