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

This should do the work:

^([0-9]*[a-zA-Z]){3,}[0-9]*$

It checks for at least 3 "Zero-or-more numerics + 1 Alpha" sequences + Zero-or-more numerics.