Regex to check for at least 3 characters?

Question

I have this regex to allow for only alphanumeric characters.

How can I check that the string at least contains 3 alphabet characters as well.

My current rege

Answer 1

+ means "1 or more occurrences."

{3} means "3 occurrences."

{3,} means "3 or more occurrences."

+ can also be written as {1,}.

* can also be written as {0,}.